Could this be implantation bleeding?

We’ve been trying for almost a year to get pregnant and I don’t want to get my hopes up again! Last had unprotected sex last Monday (the 14th) and according to eve ovulated Wednesday (the 16th). I know that might be a little early for implementation bleeding but this is seriously the only bit of spotting I’ve had since I ended my period on the 11th. However, this is the first time in four months that I haven’t started cramping and bleeding within 3-4 days after unprotected sex.