Is this implantation bleeding or...?

Is TMI.

So I'm a day late on my time of the month, I've been having quite bad pregnancy symptoms such as sore breasts, backache, nausea, off my food and can't stand the smell of meat cooking or taste. However just got this, I can't tell if it's actually my period starting, or if it's implantation bleeding? What do you guys think? Sorry if this grosses anyone out.

UPDATE: this was my cycle!

I've put this down as my "period" for now just in case, but I'm so confused. We are ttc and also tried insemination on 9th and 10th. I also did some pregnancy tests on 22nd - 24th and one was faint, but then the rest were negative.

Thought this was interesting.

It's interesting that it says it can occur around the time of a missed period, and of course I am 1 day late. Fingers crossed!!