Suggest Treatment For Abdominal Pain And Vaginal Spotting

so yesterday i started noticing slight abdominal pain so i took some ibprophen and it went away and i also started to notice a light brown colored blood but only when i wiped, i figured i might possibly be prego but then i woke up this morning with really bad abdominal pain to the point where i kept tossing and turning and the blood became alot heavier and darker red with a dark brown almost black color mixed in, and a clot or something here and there i read some info onlin about mular bleeding and miscariages im afraid it might be a miscarrage but not sure...i took a pregnancy test from the dollar store and it says negative...not sure what to do next...pls help