Worried or confused

So I had sex almost 3 weeks ago on a fertile day and well I took two tests and got two faint positives and then I was 6 days late on my period. I had a lot of nausea And back pain and headaches and just tired. Well tonight I got home from Christmas shopping and I had to go use the bathroom when I went to wipe I had blood on my toilet paper but like it was just very light? Am I pregnant or Have I miscarried or what