Pregnancy symptoms too early?

So I had sex on my ovulation day, which was 4 days ago. I know everyone will probably say it’s way to early, so I’m definitely not going to text because AF isn’t due until next Friday anyway. But I have been feeling kind of weird. As the days go on, I feel a little bit more nauseous and tired. Last night, I woke up in the middle of the night with some twinges on my lower abdomen on my left side, alone with some cramps in my stomach. Little ones, not severe. And I’ve been craving some things, nothing too crazy. I’ve also been having some mood swings, and my nipples are sore to the touch. It wouldn’t be weird if I wasn’t so far from my period. PMS symptoms for me usually start within 5 days of AF. But I’m 11 days out. Could it be all in my head? I’ve heard that it’s possible for some women to conceive on the same day they ovulate, especially if that’s the day they have sex. I’ve also heard some women say that they began having pregnancy symptoms way before they had a BFP. This would be my first time, so I don’t really know what to look out for.