Pregnant or not ?

How possible it is for me to be pregnant right now? So I had sex before my period he came inside and after my period and he came inside as well. But since my period ended (5 days ago) I’ve been throwing up. For example today I woke up and I went directly to the bathroom to throw up. I honestly don’t think I am because it’ll be too soon for the symptoms but then I don’t know.. but i haven’t been eating that much so it could that be the reason ?