Fertility Windows

Ok. My partner and I had sex during the purple part of the period calendar (the non fertility thing), about a week before my Period. After sex he cleaned up and we were about to go for round two but he accidentally slipped in. He said he was clean and it only went in a little before putting protection on and stuff. My period is suppose to come tomorrow. I'm worried it won't come and I may have accidentally gotten pregnant. I've had a scare like this before but it turned out to be a late period. I don't know if this is for real this time or my period is gonna be really late (again). Also I've been feeling really sick too lately 🤒😷 but that could be food poisoning from a party I went to. But for me the timing is making me really anxious. Help please!