I have been hypothyroid since I was 15. Got better at 20. Had my son at 28. I've been infertile since then. Actively started trying since I was 35. Had a very sick son with diabetes since a year old. Was in the hospital on and off for the first 7 years. couldn't think about getting pregnant. went through iui's and ivf's for the past six years on and off. had several surgeries in between and had to take some time off. had several miscarriages also in the past 3 years. lost the last 6 embyros that were implanted in june 2008. not one took. doctor said my tsh was too low. i was in graves disease which is hyper thyroid. your tsh controls your lining for implantation. if it is too high or too low the embryo cannot implant.write back nancyg