12 days late!!

Charlie • I like cats and pizza a lot. I'm married. 21. Always hungry.
So I'm 12 days late. I'm usually NEVER late. If I am, it's never this late. 
Well, my husband and I had sex mid-late October. He hadn't pulled out fast enough (that's our only form of bc btw lol and that's like the only time it's happened). So November comes around. I was 8 days late. Super weird period. I spotted the first day(24th) then bled the next and it ended the 26th. My period usually lasts 4 days. So it was really weird. I took a test before it started and after and they were both negative. Well December came. No period. 
It's now Jan 3rd. No period. Took 2 tests. One Sunday(1st) night and Monday(2nd) morning (first pee of the day) both negative. No faint lines or anything. 
I'm going to be making a doctors appointment by the end of the week, whether it comes or not just to see what's going on. Buuuutttt this has given me crazy anxiety and it's pissing me off. 
Has this ever happened to anyone else? Were you pregnant? Or was it something totally different? Anything helps. Thanks💕
Edit: I updated the app to show when I had my period in October. Before I did that it said I was 12 days late. Now it's saying 4. I use another app, Flo and it's still saying I'm 12 and telling me to switch to pregnancy mode. 😂 I've been using that one longer. 
Also, I've been discharging white the past week. Till Sunday. It's just been clear since.