Is it possible to feel pregnancy symptoms 2-3 days after you MAY have conceived?

I had sex 2-3 days ago and I have been feeling nauseous, yesterday was not bad but this morning it was way worse. I thought maybe it’s cos I’m hungry but even after eating I still feel very nauseous. My breast are also getting heavy with slight pain

I have two kids already, both girls. I never had nausea with them .

Is it possible to feel pregnancy symptoms right after you may have conceived or it’s very rare?

I know google says it’s not possible but other moms have said it is possible because they’ve felt symptoms or have had gut feelings and it has turned out to be true.

I feel stupid thinking it may be pregnancy but at the same time, it’s my body and something is definitely not right .

I had my period the beginning of this month and my period lasts 4 days.