But about a month ago I had terrible cramps and a huge blood flow for only a couple hours, I didnt really think much of it because it didn't last very long. But now for a little over a week I have been having bad cramps and back pain and an odd mucus discharge, it's clear most of the time every so often it has a pink tinge. I have been on amoxicillin for maybe 2 weeks, could that be the cause? Or is there something wrong and I should see a dr? The cramps are pretty bad at some points. Please help I'm pretty freaked out!