Implantation or another early period?

Ive been having brown discharge, and when i wipe its light pink/brown. My last period ended on march 26th and the one before that ended on march 6th. I had 2 periods in one month. My next period isnt due for another 2 weeks give or take. Me and my husband had unprotected sex on the 1st of april which i wouldve been fertile then. Im on the birth control patch and ive never had abnormal bleeding until here recently. My periods were always regular so im super confused. If it stops or doesnt get heavier ill take a test this weekend.