Chances of pregnancy?

Sierra • Wife | fur mama | mommy to Eliana due 1/24/20 💗
I got my period on the 11th and currently on the 13th it has almost completely stopped. I had abnormal periods for a while last year but other than that, my periods usually come within the same few days every month and last from 6 - 7 days. During the first and second days of my period my fiancé came inside me. I was still bleeding pretty heavy then. Shortly after the second time it slowed down and now it is so light that it's practically stopped. Can someone please explain this to me? I'm not afraid of getting pregnant right now. It wasn't planned but if I am, I am completely okay with it. I would just like to know why this happened and if it has happened to anyone else? 
On a side note. I recently had mono and strep so I have been on some heavy antibiotic medication and anti inflammatory medication. I think that would also make my body unfit for pregnancy or maybe play a role in it somehow. I'm not sure if it has anything to do with it but I wanted to mention it. 

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