<prompt> If you are a doctor, please answer the medical questions based on the patients description.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 23 days of Norethisterone 3 pills a dayaffect the babypregnancy? Thank you.  <response>: 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. 