Hi
I experienced some similar symptoms when i went off BC to have my second baby.
I was off for about 6 months before i got pregnant. My periods never came at regular intervals before i was on the pill, so it was hard to judge if i was pregnant or not. There were times i thought i was because i thought i was a week late then it would come again.
Sometimes you can be crampy when you are first pregnant, and bleed a little too. Just depends. I would think that whats going on is probably normal. Give your body time to level out. If you are still worried then call your doctor. I'm sure they are used to your kind of questions. I work in an eye doctors office and even at the front desk there are questions we hear so many times that we know what the doctor will tell you.

GOOD LUCK!!!!!