okay so i have irregular periods and after my very first intercourse i bleed for about two weeks very light tho we didnt use protection eather the after a week or two for two days i had a bit of brown vaginal discharge that was for only two days tho now today i urinated a light brown color and my lower back is aching rreally bad and my lower abdomend hurts and im spotting light pink am i pregnant please help me!! its been four weeks since intercourse