Sounds like a UTI ...call ur doc..=)
It's either a UTI or bladder spasms. If my bladder gets really full, I get awful pains right after I go, and they're bladder spasms. It happens because the baby is pushing on my bladder. However, it's always best to get checked by a doctor. If it is a UTI it needs to be treated with antibiotics.
It sounds like an uti, drink a lot of water.