Time to freak out?

So here’s the information:

I’ve been on birth control pills for about 16 years. I’ve never had a regular period except maybe 6 months at a time here and there. They’ve been pretty regular for about 6 months now. But, 2.5 months ago I got off of the pill.

I had sex twice recently using the pullout method. There was quite a bit of fourplay before hand, and i wiped them off before going in lol! and I know for a fact they didn’t cum before pulling out (took a little bit after pulling out for them to get there).

The first time we used the pullout method was the day after my last period. I had tested with an ovulation strip and there was no ovulating. My app said I had a 1% chance of pregnancy.

The second time was a week later. I had still been testing with ovulation strips and still- no ovulation, app said 2.7% chance of pregnancy.

Both of those things were about 3ish weeks ago. My period was “supposed to start” yesterday. On Sunday (4 days ago) I started bleeding and cramping and having all the normal period issues I always have. Monday I still bled but it was light. Tuesday VERY LIGHT (pretty much nonexistent) and Wednesday there was just off and on spotting. Thursday, there’s just “old blood” when I wipe.

I can’t tell if this is something I should freak out about- implantation bleeding/possible pregnancy, or if it’s my body responding to being off birth control.

I know I sound paranoid, and I am. Lol help.