I recently switched from the Depo shot which I had been on for almost 2 years without getting a period, to Tri-Sprintec which I am on my 3rd month and got my period all 3 months (the first 2 were like my regular periods). I got my period as usual on the 5th and I bled pretty heavily for the first 6-8 days of this period (which I read that abnormal periods can be ok for the first few months), yet I am still bleeding (light but its annoying and its got the consistency of discharge) and it is the 21st (16 days later!) I am scared and would like to be directed in the right direction as to what I should do, is this serious? Or could this be a normal side effect from the switch from one method of birth control to another?