It could be absolutely nothing or it could be, as you know, a sign that something isn't right. Is there any reason your cervix would be irritated? Sex, you've been checking cervical position, you've had a scan (even if abdominal, I get spotting even after these), had treatment for thrush, etc.? Any of those can cause spotting and bleeding. Personally, I've had bleeding (like sometimes full on, heavy, soaking through things bleeding) in all of my pregnancies and it's been the heaviest in my two healthy pregnancies? I actually didn't have much spotting and only one wipe of blood with my miscarriage (this was with waiting 6 weeks for a mc to happen and eventually I needed a d&c). So in my experience, spotting and even heavy bleeding can be completely normal in pregnancy. I had about two weeks of it with this baby around 7-9 weeks, including about 2 days of pretty heavy bleeding. All was fine. I'm 19 weeks now and I'm not had any more since around 12 ish weeks. Sometimes it's just one of those things, but I find definitely anything that might touch or irritate the cervix can definitely trigger it.