me and my boyfriend had sex about 3 weeks. he didnt use a condom. im having cramp like pains in my stomach. im lightly bleeding on and off. this started happening about da 11th or 12th. its now the 14th of this month. im not expecting my period until the end of the month. ive been constantly running to the bathroom to urinate. my breast have enlarged and they're a lil sore. certain smells make me a lil nauseous. this has happened about 3 times before but ive taken pregnancy tests in the past and they all have came back negative. could i be pregnant?