Peeing alot?

Hey ladies! I have a question. This morning I have peed three times in the last hour and 1 time each hour before that. And every single time I have to pee soo bad and a lot comes out. I have not drank anything since I woke up and I'm getting worried. My period has been irregular since having my son 10 months ago and I'm on birth control. Yesterday I had period cramps but no bleeding yet ... What are your opinions? Sorry for the long post!