Could I be pregnant or just sick?

Long story short my bf finished inside me on the day I ovulated. This app is on the dot for every month, to the point it's a little creepy tbh. That was three days ago, now I've been having fevers and bad headaches, dull/sharp cramps on my lower left and sometimes right side, and it feels like a lot of pressure on my uterus. I also keep getting dizzy and really tired. So million dollar question is, do you ladies think I could be pregnant or have just caught a bug?