Bright red blood

Megan

So I had sex around a week ago(he pulled out) a few days (maybe one day) after my period ended. I’m on Lo Loestrin Fe, and I’ve had breakthrough bleeding before. But today I felt mild to severe period cramps, and i was bleeding bright red blood, and each time I wiped more came out. I bled brown last night, and black just now. It was like a light period, and idk if it’s my period again even though I had it a week ago, or im pregnant.