LMP 11/11/14 had sex the entire week afterwards, unprotected. pregnancy symptoms, nausea, increased urinations, diarrhea, etc. bleed lightly for 2 days with mild cramping( a day after missed period) (when originally diagnosed with dysmenorhea, period usually extremeley heavy & 4-5 days long with extremeley painful cramps) blood & urine test negative at doctors office on dec 4th. woke up today vomiting & already used the restroom twice in an hour. & have diarhea I want to beieve im pregnant, but why wont i test positive. & whats s up wth the two day bleed? am i pregnant?