Cramping and nauseous

Ovulated last monday and was having sex during my fertile days . These last few days my body has been achy , bad cramping , lower back pains , massive eating , nipples hurt and me and my boyfriend have been sleeping alot and he has bad heartburn and eats alot HELPPP CAN THIS BE SIGNS OF POSSIBLE PREGNANCY ? Also a psychic told me that i needed to take a test soon and i didnt say anything about being pregnant to her she automatically asked me was i pregnant !!!