Help. Confused

Breanna

So I started the Depo shot on day 3 of my period (12/3) I had unprotected sec (oops) on 12/15. I’ve been feeling sick so I freaked and took a pregnant test. The first one was negative, the next days was positive(however the test sat for a long time before I saw the line. After the first minute or so there was no line, came back 30 min later and there was a for sure dark line) then I took another test, this time just a cheap dollar store test and got a very faint line on one and a negative on the other. I’m a week late for my period, but I’m on Depo so that could be normal. What the heck is going on. I’m calling my dr tomorrow but I’ve been losing my mind over this all weekend