Well, I got two lines. Advice please?

Well, I'm a little but concerned. Last month I had my second miscarriage in a row. Now I'm pregnant again. Almost 6 weeks from the day the fetus had passed. I know that waiting at least three months is the way to go, but we've been safe and this is unbelievable. Last time, I cramped from the very beginning. And I lost all pregnancy symptoms. I took my test today and all of a sudden I'm cramping? It's so dumb. Idk what to think or do. Can anyone tell me how common it is to have a third mc in a row? I do have negative blood so I know that plays a factor in pregnancy but I received a rogam shot literally a month ago....  Please help?