What could this mean? *period or...

So, I had unprotected sex this month.

I usually start on my period after cycle 27 or cycle 28. I was one day late on my period.

Today is Cycle 29. I got my period around 4pm, or I think so... I don’t know if it’s my period or implantation bleeding. I “fingered” up my vagina to see if there’s going to be any bleeding coming... I pulled out and on my finger, there were some light dark-red blood.

At that point, I knew my period was coming.

5 hours later, my pad had like a dark old brown-red stain. It wasn’t a heavy flow.

Earlier when I went to pee and I wiped, it was just a little tiny dark brown stain. Like, old blood.

It’s so dry but if I “fingered” down there, it’s wet and slimy. It can’t be implantation bleeding Cos it’s not like a light faded pink or red color. I know it’s only day one but I usually bleed a lot more and there would be clumps and tissues coming out...

hmphm... I’ll see what happens tomorrow, but any ideas? Thank you.