Is this implantation bleeding? First I had brown discharge, and than it was pink, really light

I was wondering if anyone can help me I've had two days of bleeding then third day brown discharge and then the forth day I'm having red/pink really really light discharge which I can only see when I sip myself and also I'm having really bad period like pains and I always have 5 days of full period heavy until the forth day the gradually turns light on the 5th