Plan b side effect? Or something else??

Hello so I took had sex on the 18th of this month. We used a condom but it broke & he finished in me. 8 hours later I took a plan b for the first time. I felt fine after taking it. Didn’t notice anything different.

We had sex again the next day. Condom was perfectly fine. So fast forward to now. My period was one day late which isn’t too far off for me. It came the next day but it was a dark brown. I thought okay maybe spotting. It had just a little bit of red but mostly just dark brown.

Fast forward to today & it’s still that dark brown color. And it’s not heavy . I just want to know Is this my period? & does it look this way due to the plan b?

Thanks in advance!

Vote below to see results!