Donated embryos are frozen, so all that's needed is for the timing of the embryo transfer to be perfect. This is calculated in exactly the same way as if you were using your own frozen embryos (refer to Chapter 5), depending on whether you have a regular menstrual cycle or an irregular menstrual cycle:
1 Regular cycle: Just after ovulation is the best time to transfer the embryo, so you need to have an ultrasound examination and urine and/or blood tests to pinpoint the day of ovulation and then the embryo is transferred a few days later.
1 Irregular cycle: If you don't ovulate every month, you have to get the lining in your uterus perfect for the embryo by either:
• Taking clomid tablets or having follicle-stimulating hormone injections to make you ovulate
• Taking oestrogen and progesterone to build up the lining
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The first trimester is very important for the mother and the baby. For most women it is common to find out about their pregnancy after they have missed their menstrual cycle. Since, not all women note their menstrual cycle and dates of intercourse, it may cause slight confusion about the exact date of conception. That is why most women find out that they are pregnant only after one month of pregnancy.