Implantation bleeding or period?

I have a 6 year old son and never had any implantation bleeding, nothing at all. I’d say it was the perfect pregnancy (I’m sure I jinxed myself now lol) anyways, I’ve been trying for about a month now to conceive another child, we figured out the best days to have sex and gave it a try. About a few days later my boobs have been tingly and full feeling, and giving me some hope! Saturday I started bleeding (4 days early of my period)

A bit of a back story: my period is always late, rarely on predicted start time so this is what is confusing me. It’s Tuesday today and bleeding has stopped. For the three days it wasn’t a lot but enough to have to wear pads for those three days. My question is: was it implantation bleeding or just an early period? And how can I tell if it was either?