Could I be pregnant?

I got off my period 6 days ago. About a day after my period I had brown discharge. Like it was cleaning itself out from my period. Well for about 2 more days I still have brown discharge but not a ton. On the 4th day (may 28) I had light bleeding. It was like a light pink but it was there. Now a couple days later it is still light pink but with a watery type discharge. Could this be implantation bleeding or something else? I’m not so sure if you can get implantation bleeding right after your period or? & I want to take a test here really soon so when would be the best time to? I was thinking 3-4 days from now.