<s>[INST] I have trying to conceive for 18 months and have taken first cycle of Clomid this month. My cycle is normally 29 days. I am on a religious holiday in next 2 weeks which will be at the time of when my next period is due. My doctor has prescribed me Norethisterone to delay my period for my holiday but what of I am pregnant this month? I have to start this 3 days before period due and pregnancy tests are not that accurate at that time. If pregnant will 2/3 days of Norethisterone (3 pills a day)affect the baby/pregnancy? Thank you. [/INST] Hi, You should get a serum beta-ChatDoctor estimation as urine pregnancy tests are not conclusive at this stage. This gives you a definite confirmation. Use of Norethisterone at this stage and for a small period of time is usually harmless as the teratogenic period has not yet started. Please get a pregnancy excluded first before you take any more medication. Blood test for pregnancy can read well at about 10 days after ovulation. Hope you find this information useful. Take care. </s>