Implantation bleeding 4 days..

Hi!

So my partner and I were trying to conceive around ovulation day. I assumed it worked as I thought I had implantation bleeding. This bleeding started 4 days ago (roughly a week before my expected period) and it was really light brown spotting. This spotting lasted 3 days and then today (the 4th day) it became a lot darker brown. Is this normal? It’s not heavy enough to fill a pad or anything like my normal period and my period is regular. I’m due for my period on Tuesday.

please help!