I had my last period on march 1st. on march 17th and 18th i had unprotected sex with my date three times. He did not pull out. I have been nausea and gagging alot. My boobs feel bigger and heavier but not to tender a little. I do have dul cramps that feel like menstrual cramps and lower back pain. i am also having discharge alot! Could i be pregnant even with lower back pains and cramps?