I can't get the feeling I have to pee to go away??

I am 7 weeks 6 days, and it just started today. I pee and the second I stand back up it feels like I have to pee again. I don't know if this could have anything to do with it but my large dog slept pressed against my stomach all night and it made me have to pee more. But I can't get it to quit. Any advice/similar stories?