Am I pregnant (Birth control on placebo week)

Alright guys so i know the best way to find out is getting a pregnancy test. But I wanna hear your guys thoughts

I started taking birth control two months ago and it’s Larin FE 1/20

And at the beginning of my second packet I had sex and it was very deep penetration with a condom on for extra protection. It’s been 3 weeks now and I’m taking the placebo pills right now. Im on my 4th day on my period (my period is normally 7 days long) but hardly anything is coming out. My period has been pretty dark in the pad. When blood comes out it is slightly red but also brown. I’m normally a heavy bleeder so my period getting so light is scaring me. I had cramps on the first day which is normal but this is all scaring me haha. I feel like my uterus area is more bloated then normal. What do you guys think the likeliness of me being pregnant is?

(My boobs have been kinda sore some weeks but right now they are fine.)