cycle day 43 😞

i had unprotected sex on november 9th, but i had been on the mini pill for 2 weeks so well out of the 7 day wait, he also pulled out (so he says). My last period started October 28th or 29th and ive had none since. I had taken a test last monday and it was a bfn (though i did drink a lot of water before hand and plan to test again) I havent missed a pill or taken it outside the time frame. Is my body just adjusting to the pill (i was on this type before coming off it to have my daughter and never had a period on it) or could i actually be pregnant? I did get a bit of cramping around the time my period was due but no blood.