I am 22 years old get my period regular every 28 days. I am not too sure what to think of this on sat march 18th I started menstruating, and then I had started an antibiotic on march 25th I was told that the antibiotic wouldn’t work with the pill so I stopped taking the pill. Friday march 24, saturday 25, sunday 26. I had unprotected sex. According to my calendar I started ovulating on sunday march 26th. Today is march 30th and I am bleeding light pinkish red. My period isn’t due again till saturday april 15th. My stomach feels a little bit campy, but I think its nerves from seeing that I am bleeding, and worrying about it. I just noticed. I don’t know what this is?