Oh no??

So, my boyfriend and I did have sex while I was fertile twice. Once towards the beginning and then again the day before I was ovulating. Now I'm a few days away from starting my period and I'm not feeling like I usually do at this time. I'm getting dizzy, nauseous, I've been super emotional, I have lower back and cramps where you do with your period. I'll also get hungry so I'll eat but then after a few bites I start feeling sick, but that's only with some foods. I'm just not feeling well and I'm not sure what's going on because I never feel like this the week before my period. Help???