Am I pregnant or not?

Hi everyone,

This website is completely new to me. I'll briefly explain my question and situation, hoping you can give me an answer because I can't really find it online.

I'm 23 years old. On Tuesday, December 26th, I had sex with my boyfriend for the last time. I had been taking the pill for about 9 days (I restarted on December 17th). I took my last pill on December 25th, after which I stopped taking the pill—I only took them for 9 days, on purpose. I also started taking the pill again 2 days later (I should have started on December 15th).

Two days ago, I lost a few drops of blood, very minimal. This morning, my period started.

Now, with New Year's, I've eaten very little, and whenever I did eat, I felt quite nauseous quickly.

How big is the chance that I'm pregnant?

Thanks in advance for your time.