Could this be a implantation dip in bbt?

Around 2 (2,5) days before o I had sex with my boyfriend and so there is a change of being pregnant. But is it too soon to implant already or could it be at 4 or 5 dpo?

I have been feeling a bit off like very bloated and extreme sore nipples (what I never had before). I just really hope I will have a bfp this month!