Chances???

Hi guys, soo my baby daddy and I had sex on August 29th when I was on my period and then it stopped the next day when it wasn’t supposed to. But then a few days later I spotted while I was supposed to start my ovulation week. I had started my birth control maybe a week or so before that. I got pregnant with our son around this time last year and we weren’t really trying to get pregnant again. But the past week I’ve been super nauseous and overly tired, more than usual. My period isn’t set to start until the 23rd of this month and last year when I was testing before my period I kept getting false negatives so I know trying to test now wouldn’t be very accurate. I just want some opinions on what the possibility of me being pregnant again is and if it sounds like I could be.

Also please don’t bash me, I was trying to be careful about not getting pregnant this soon again. Thanks