Realistically could I be pregnant?

hi all.

On the 28th of December roughly 4 days after my period ended I had sex without a condom for a few seconds.

It was the first time I had seen my boyfriend and both got excited.

I read someone’s TTC post about having dreams every night is a sign of pregnancy loool...

I’ve been having constipation and pain at the side of my boobs which to be fair could be explained by AF in the next 6 days

I’m not bloated or hungry for anything...

I have had stomach cramps and also taken two first response tests this morning and both were negative.

When would be best to test next? And could I be pregnant?