Hi there... I need some advice.. On then 10th of may I had unprotected sex on the 19th I had unprotected sex again a couple hours later I started spotting the next day when I woke up my period had started and was a lot heavier then normal it lasted for two a half days and then got very light only there sometimes my period never comes until the 28th or 29th of each month its never early and never late I have been pretty tired lately and get head aches and heart burn often I took a test today the 23rd of may and it was negative any suggestions?