Could it be implantation?

Ariel
Hey y'all, I have a question. I'm 5 days late for my period and me and my SO have had sex Friday, Monday, Tuesday, and last night. I've been spotting since Monday ( before we had sex on Monday), and the color has changed some. It started out clear/pink, as of now it is sorta a tanish brown color. It is EXTREMELY light ( so light it barely shows up on a liner) and way too light to be a period for me. I had implantation bleeding with my first but I don't remember it looking like this. So I'm going to ask y'all, did anyone of you have anything like this happen to them during implantation? Plus I've had some dull pains but they didn't really hurt just somewhat achy and annoying on my left lower side. Thanks everyone!😊