I had sex on November 22 and I was due for my period the next week. I always ALWAYS get my period on Thursdays, and oddly got it on Tuesday November 25. It was extremely light and only lasted a couple days which I thought was strange. The week after on a whim took a pregnancy test and it was positive. I was like What>?? So I took another one the next morning and it was very faint positive. The week after that I went to a clinic for a blood test and it was negative. So I thought well that's that. I was due for my next period the week of Christmas and I never got it. I took another test and it went a super faint positive and then turned negative. I don't know what's going on. I do have a Dr's appointment coming up but I'm really anxious to know what's going on. Does anyone have an thoughts??

One possibility is that you were indeed pregnant but had a very early miscarriage. Happens more than most people realise but majority of women never know it.
It could be that you are pregnant and while some tests picked it up, others did not.
Might be that your cycles are off for some reason. Unfortunately we can only speculate and you will find out for sure when you see your doctor.