Implantation bleeding ??

So I am not sure if this is implantation bleeding or what it is me and my bf have been trying for 5 months now and at around 8po I had some spotting which I thought was my period starting so k put my diva cup in I then checked later that night and there was like one speck of blood and that’s it then I stopped bleeding for 4 days now and have only been having brownish pink on the toilet paper every now and then when I wipe and nothing enough to get on my underwear just wondering if anyone has had this before as this is nothing like my period would be and I am confused at what’s going on ?? My period usually is really heavy and I have it for 6 or 7 days and has been regular since ttc period is due on the 22