I need advice ASAP!! Losing my mind!

Tiffany
I really need some type of response. My husband and I had sex he went in me twice it was a well before my schedule period. Anyways I had my period like planned but it  was only steady for the first 3 days 4th day spotting and 5-7 day nothing at all! I'm trying not to stress but I've been peeing a lot more and I've been cramping and spotting a little since yesterday. I took a test last night and it came back negative my next period isn't due for about two wks! I need to know if I'm losing my mind!!:((