Hi i am a newcomer to all this, but really feel i could use some advice from anyone who has an under active thyroid. I have been on 100mg of thyroxine since Oct 2010. I have been feeling so much better since taking the meds, so my husband and i started trying for our first baby together. ( i have an 11yr son). We were over joyed that after 2 wks of trying we found out we were pregnant. But at 5wks i started passing brown discharge which the doctor thought was implantation bleeding. But several days later i started bleeding heavily and cramping. So i presume this is a miscarriage. The midwife says to do a pregnancy test in the next few days. Obviously we are devastated and upset. I am now worried that my thyroid issues are going to prevent us having a baby. Is there anyone else who has had this problem? thanks.