Late, cramping, pain... pregnant‽

I took a Plan B towards the end of July, and afterwards had a "period" that ended around the 25th.

I never got my period during the month of August, I have taken two pregnancy tests and they're both negative...but I have mild cramps every. single. day, and I'm so bloated to the point that it often feels as if I have to poop/pee--even if I can't. Within the last week I started to have a pinching/very, very mild feeling of inflammation *inside* of my vagina.

I've had some extra discharge, but there's no scent and no color. It's completely clear and either very watery or gooey.

I'm concerned that something could be wrong--or that I could just be getting false negatives on the pregnancy tests...

I have scheduled an appointment with my doctor, but I won't be able to get in until next week. Any ideas what may be going on? Just side effects of the Plan B? A potential infection?