Could it be?

Okay so, for the past couple of months my s/o has made my period come through sex. Is that normal? Hopefully. I never have allergies or get sick but I have had the flu/allergies for the past week or so. My period came(through sex) and its light and weird. My body hurts all the time and I constantly eat everything. I've gained weight and currently trying to lose all of it. I feel sick at the most random times for no reason. I don't know if I'm pregnant or not but I had a feeling and then I drank and my period came the next morning because of rough morning sex. Someone clarify that I'm not crazy. Sorry for the confusing way to put things.