implantation bleeding?

Ok so I'm worried... I have been having a very light bleeding/discharge it was pink at first but now just mostly brown. It's not a constant thing or nothing but this is the 3ed day. Everything I read and hear says implantation bleeding and that would be amazing if I could really be pregnant but I don't want to get my hopes up to he let down. My periods are irregular and according to the app isn't late yet. I've also been cramping a little. Could someone please give me some insight on this if they can..