I've had a similar situation to you so I hope this helps. I had a misscarriage at 14 weeks in which I spotted. I had a second pregnancy a few months later and began to spot again. I ended up having a small clot (I don't remember the medical name, sorry!) behind the placenta that was causing some irratation, and it was perfectly fine. They told me it would go away further into the pregnancy and it did. If you have any type of spotting though please get it checked out, it's better to be safe then sorry. And it's okay to worry, you're going to be a mom, practice now.