watching my lines.. please respond.

I was never told my HCG levels during pregnancy, and they didn't take them when I miscarried so I've been kind of watching myself by taking pregnancy tests and watching the line disappear. I miscarried June 19 with misoprostol. I took a test July 4 and it was immediately positive still. Took one again Sunday the 9 and it was faint, but still there. Just took one again two days later and it was slightly darker than the one I took Sunday, but not by much. I figured with as fast as it went down between the 4 and 9, it would be gone or almost gone today. We have been TTC again though and I have not yet gotten my period. I have an ultrasound tomorrow to make sure all of the MC tissue is gone. But I have been having the same symptoms as my last pregnancy. Am I grasping at straws? Could I be pregnant again? Pics of the test from the 4 and the one from the 9.