I am 5 weeks pregnant with my second baby and i'm worried that I might miscarry. We've been trying to conceive for 8 months now and I wasn't ovulating. 2 months ago the doctor told us that my uterine walls were very thin and that if I got pregnant I could possibly lose it or that the problem might fix it's self. I have some mild cramping (like a period which is similar to what I had in early pregnancy with my first child) and some lower back pain. I've also been very gassy so I don't know if that could cause my back pain. I haven't been bleeding or spotting. I've only had normal discharge. Also, I keep taking pregnancy test and they're always possitive. Am I just worrying myself for no reason or can I be having an early miscarriage?