What are the chances of me being pregnant even though I am on my period. The week before my boobs were sore, and my boobs are never been sore. I have had extreme heartburn last few days, I feel nauseous everyday for the last week and half on and off. And if I smell something that smells bad to me makes it worse. My appetite comes and goes but when I do eat. I eat way more then I ever would normally. I know it can happen but I'm just courious.