Here's a stumper for you. False positive?

My boyfriend has been gone for the military since July 11. We last had sex July 8 or 9 where he came in me and then July 10 I got my period. It was heavy and lasted 5 days.

3 weeks later I started feeling very sick so I decided to take tests to be safe. Both came back extremely faint positive immediately.

I know blue dye tests aren't good I'm gonna grab FR later. But is this a false positive?? It makes no sense.

Just took a FR... Doesn't look negative