Many women and midwives swear by red raspberry leaf tea during pregnancy.  Here is information on the benefits of drinking the tea during pregnancy, though as always please consult your provider before taking any herbs:

This is from Rodale’s Encyclopedia of Natural Home Remedies:

The Raspberry Leaf Tea Story

Tea made from raspberry leaves is the best-known herbal aid in pregnancy. Rather than go into all the traditional lore about this herb, we present the following lengthy account, because it is both contemporaneous and highly specific.

“My mother was born and raised in Scotland, coming to America at the age of 26. Whenever a member of her family became ill or had a health problem, her mother had consulted an herbalist or herb doctor. As a result of this, I was treated with herbs as a child.
“Mother had always told me that red raspberry leaf tea would prevent miscarriage and was excellent for pregnancy and childbirth. When I became pregnant, I immediately sent for some raspberry leaf tea and began taking one cup of it each day, made from one teaspoon of dried leaves added to one cup of boiling water and steeped for 15 minutes. I had a very normal pregnancy. Then I went into labor, I truly expected to have an easy labor and delivery because I had faithfully taken the tea. While it is true that I did not have a complicated or extremely difficult time, it was not by any means easy. The tea had not lived up to my expectations.

“It was not until sometimes after the birth of my daughter that I read a book my mother had brought with her from Scotland entitled Dragged to Light by W.H. Box of Plymouth, England. In it I found the secret of just how to take the tea so it would truly work wonders during labor and delivery. Box said, ‘On one ounce of raspberry leaves pour one pint of boiling water, cover and let steep for 30 minutes. Strain, and when the time for delivery is approaching drink the whole as hot as possible.’

“There were a number of testimonials in the book written by women who had used this herb. Several took the strong solution over a period of time before going into labor. They were instructed in that case to take a wine glass full three times a day. They had ‘only two stiff pains and it was all over’ or ‘no after pains and very slight before.’ They never made it out of the house. Box’s instructions were, ‘But those who take the tea considerably before the time should not leave the house when the time is approaching as many mothers are delivered almost suddenly when at their work, to the great vexation of doctors and nurses.’

“When I became pregnant again I was determined to try it that way. I still took a cup a day as I had before. but this time when I went into labor I made a strong solution of it as I had read in the book. I put it in a container and took it to the hospital with me. I wasn’t sure how quickly it would work and I didn’t want to have the baby in the car. I didn’t think they’d allow me to drink it in the hospital so I drank half of it in the parking lot. I was afraid to drink all of it as it was so strong and I didn’t personally know anyone who had taken it this strong before. I had been having strong contractions but by the time I registered and was taken up to the labor room the contractions were so mild I hardly felt them. Upon examination they said I was ready to deliver and would not even give me an enema. In the delivery room I was quite comfortable and hardly felt anything. One hour after entering the hospital my son was born.

“In the recovery room there were several other young women who had just given birth also. They were moaning and groaning. I couldn’t imagine what they were making a fuss about as I felt like I could have gotten up and gone home. I had always read and heard about women getting after-pains with a second child. I never had even one. This was also the testimony of a number of women who were treated with the tea by Box.

“Later I thought I would have had an easy time anyway since it was my second child. I was anxious for someone else to try it.  A friend of mine was expecting a baby in a few weeks and she had been taking a cup of the tea daily and was also going to take the strong solution when she went into labor. She had had two previous pregnancies and both times nearly miscarried and had to take drugs and be in bed a good deal of the time. Both deliveries were extremely difficult. When she became pregnant this time she began spotting and it looked like she would have to go through the same kind of trouble she had before. Having used an herb I had given her for another problem, with success, she asked if there was an herb for this problem and I recommended raspberry leaf tea.

“She started taking it and the spotting stopped immediately and she had a normal pregnancy, much to the amazement of her family who remembered her difficulties in the past. When she went into labor she took the tea as I had and told me she had only 25 minutes of hard labor before her baby was born.

“I have told a number of women about this amazing herb through the years, but no one else seemed interested enough to try it. However, 1978 my daughter became pregnant and she was very much interested in having an easy delivery. She took the tea each day and had a normal pregnancy. She, too, took the strong solution of the tea with her to the hospital and also being a little wary drank only half of it. When the doctor examined her, it was late in the evening. He said the baby wouldn’t be born until six o’clock in the the morning so he went home. She was having hard contractions at this time and I was very disappointed and felt the tea hadn’t worked. An hour and a half later we recieved a call from our son-in-law saying we had a little grandson. The tea started working and the doctor had no sooner reached his home when he had to turn around and come right back to the hospital. My daughter said the next time she is going to drink all of the tea.”