I'm really scared...please answer

I'm 3-4 weeks n since I've been pregnant I've felt light cramps almost like I had to poop... o felt that way tonight I fell asleep for a lil bit n wen I woke up I didn't feel that anymore ... I peed but there was no blood ....could the lack of cramping n heaviness down there mean I miscarried...please answer I can't see my doctor until tomorrow at 6 pm