Ok - I have managed 5 cups yesterday!
I actually don't mind the taste at all - it is really quite refreshing...
I don't add sugar to mine.

I found a website that will answer what it does -
Raspberry leaf is used for the following:
*Ease the symptoms of morning sickness.

*Sooth and prevent bleeding gums which many pregnant women often experience.

*Relax the smooth muscles of the uterus when it is contracting (Burn & Withell, 1941).

*Assist with the birth of the baby and the placenta.

*Calm cramping of the uterus.

*Provide a rich source of iron, calcium, manganese and magnesium. The magnesium content is especially helpful in strengthening the uterine muscles. Raspberry leaf also contains vitamins B1, B3 and E which are valuable in pregnancy.

*To aid fertility.

*To promote a plentiful supply of breastmilk.

*To help stop excess bleeding after birth.

*To treat diarrhoea.

*To regulate irregular menstrual cycle and decreases heavy periods.

*To relieve sore throats.

*To reduce fever.

How is Raspberry leaf taken?
*Tablets - Take two 300mg or 400mg tablets with each meal (three times a day) from 32 weeks.

*Teabags - 1st trimester- one cup per day -2nd trimester - two cups per day -3rd trimester - up to 4 to 5 teabag cups throughout the day.

*Loose leaf tea - Bring one cup of water to the boil. Remove from heat and add one teaspoon of the herb. Stir, cover and let sit for ten minutes (do not boil the herb), strain and sip. Adding sugar or honey many improve the taste. 2 to 3 cups per day is often recommended especially after 28 weeks of pregnancy.

*Tincture - A tincture is an alcoholic extract of the herb raspberry leaf. The dosage will depend on the strength of the tincture.