Hi I Had My Last Periods On 29 Hine 2015

Hi I had my last periods on 29 hine 2015 had sex in july 4th 2015 which was last day of me periods I took morning after pill on same day after 8 hour after and had heavy bleeding again on 11th july 2015 which remain 4 days after that no periods I was been d gp on thursday 20th aug 2015 for pregnancy test which was negative I have done home pregnancy tests all negative I am still upset because I have no periods still what should I do?