I have a light pink discharge cramps and slight back pain and a slight headache

How old are you babygirl? Your symptoms appear to be, from your description, pre-menstrual.

How old are you babygirl? Your symptoms appear to be, from your description, pre-menstrual.
Im 27 and this has never happened I have two kids and I just had my regular period last week

It doesn't sound like a UTI; you don't mention any other coloured discharge, so can't be bacteria related. I would have to say a doctor visit is appropriate to have it diagnosed properly. We can't diagnose on the net for a lot of obvious reasons. Sorry.