Hallow Dear, Please get rid of all your worries even before you start reading the following explanation. Primolut-N is a progesterone preparation. Progesterone is a hormone which is required throughout the pregnancy for its maintenance. Hence, throughout the pregnancy the levels of Progesterone are raised all the time. In fact, when in early stages (and many ties even later also), the pregnancy becomes unstable or is at risk, we do give progesterone to the pregnant woman to stabilize the pregnancy. Progesterone has no serious teratogenic effects on the baby. The only unwanted effect is if the baby is girl and if the progesterone is taken for very long time, her genitals may develop somewhat like a boy s genitals. Therefore, external Progesterone should be given with caution. However, 14 tablets of Primolut-N, that too before you missed your period is not going to affect the baby s development adversely. I hope this gives you a sound sleep. Dr. Nishikant Shrotri