I had sex on the 18th day of a 30 day cycle. Protected of course. We used a condom, withdrawal, and plan B. I got my period a day before it was due but it wouldn’t come out of my vagina, only when i pushed on the toilet, or after urinating. Nothing on pad. That went on for 6 days. The blood was red. Today was the last day.Is this just the plan b side effects? I also took a pregnancy test today and the 28th both were negative.