Obsessing after MC

I feel like some days I'm going crazy. It's been four weeks, I haven't had my first period yet and I'm having dreams of finding out I'm pregnant again. I think about it pretty much every day and wondering if I am or could be. Then the thought of "what if I can't get pregnant again?" Comes to mind and I start worrying over something that hasn't happened or is unlikely to happen. Please someone tell me I'm crazy and to stop worrying.