Hi I Had My Normal Period On The 9 Of

Hi I had my normal period on the 9 of April and it lasted for 5 days thatn Had another period on the 21st of April and it lasted for three days now I am constantly having a brownish poo smelling discharge that is so strong I have to shower 4 times a day and change pannies every few hours I have been having unprotected sex with my husband and thought I may be pregnant but took 3 home tests and all negative what can I do yo fix this embarrassing problem