Hey everyone!! I'm 15 weeks & 2 days pregnant and I've been really upset and scared lately! I'm wondering if any of you ladies can help determine whether or not I conceived Dec 12-20. I am NOT trying to determine paternity don't worry! I was on medication (an anti thyroid) that can cause embryo malfunctions in pregnancy!! I was on the medication Dec 12-20. I did have a period Dec 24 (my LMP) but I spotted right before my period which concerns me (the medication does not cause abnormal periods) found out I was pregnant on Jan 26! First ultrasound on Feb 5 was just a sack measuring 6+ weeks. Next ultrasound was Feb 20 & the baby measured 7 weeks & 4 days. My last ultrasound was March 13 and the baby measured 11 weeks & 3 days. My EDD is Sept 29. Any chance I could have conceived Dec 12-20? I'm really concerned about my baby's health! I haven't gotten a chance to talk tot doc yet because my last appt she was out! Just trying to assure myself till my next appt. thanks!!