I had sex with my boyfriend on my period, I am on the mini pill but we didn't use a condom. Now 6 days later Im getting light bleeding. I also get migraines occasionally and one occurred yesterday. I've had slight abdominal pain this morning but nothing much. It is likely that I'm pregnant?

It is possible, at this point it took 3 days for sperm to reach egg , so the light bleeding could have been implanting, but then it could have just been spotting. NO migranes are not part of this, that has no bearing. And no, at 6 days there are no "pains"

But you could be pregnnat, you will have to wait till next period and seee if you miss it or not