After losing a baby last year and trying for almost a year to get pregnant, I finally got a BFP on New Year's Day. I think I am due in September, but since the September 2011 forum isn't open yet, I am hoping someone due in August can help me. When I got the BFP, I ended up going to the fertility doctor I have been seeing b/c he likes to monitor everything closely. They did my first HCG, which was 50. 2 days later it was 114, which was fine. Two days after that it was 195. It didn't double, and I was nervous, but the doctor said they look for a 66% rise in 48 hours, which happened, so he wasn't concerned. Four days later (this past Tuesday) the level was 573. Again, it didn't double, but it was over 66%. (66% would have been 523). When the doctor called, he said that there is a 50/50 chance that it could be ectopic or an impending miscarriage. I am beside myself and absolutely sick over this. I am also so confused. Everywhere I read, it says that as long as there is a 66% rise, that is considered in the normal range, and it should double within 48-72 hours.. According to the online calculators, my HCG is doubling every 61 hours, or 2.5 days. I called the doctor back and asked him why he is now concerned, when on Friday he wasn't. He said it is because there are 2 tests that are below the doubling mark. I wish I had just waited until I was 8 weeks and gone to my regular OBGYN because this is, quite possibly, causing me an unwarranted amount of insane stress. Please, someone, anyone, can you tell me if this has happened to you or if you have ever heard of this. Today when I went for the bloodwork, I started crying to the nurse, and she said they see this all the time. About half the time everything is fine. I don't know what to do but my stomach hurts from the stress of this and i can't calm down. I am looking for any information I can find. Thank you so much.