Possible Implantation ?

So I have very irregular cycles but my periods are all usually the same (heavy flow, cramps, back pain, usually lasts about 5 days). I started bleeding about 3 days ago. The first day was light flow (didn’t even need a liner) pink with some red (Sorry TMI). The last two days have been light (not enough to fill a tampon all day or a liner) but more red. Today my breasts started feeling achy. I’ve had no cramps. Could this be implantation? Been trying to get pregnant with baby #2 for about 10 months.