Confused

Sooo I told myself I’m out for may as I got my period so I thought it was on June the 4 but it only lasted 3 days and then nothing I went to the doctor and got a negative pee test done but was told I might have gotten bv (bacteria vaginitis) so I was on this pill for 10 days 3 times a day I have completed the meds as in me completing it I still have no sign or period coming back as to switch my period are longer then 3 days I’ve been having the cramps and headaches backaches as a period but again as I stated it was only for 3 days in June but I’ve been having a light brown or light pink discharge since my period went off it is cause of the meds or is it something else I tested for all stds and yeast and they all was negative any suggestions