BROWN DISCHARGE

Hello, My period is late for almost 4 days. According to glow, Nov. 5 is the supposed date. And today Nov 8 earlier this morning i had a light brown discharge but this afternoon it is only visible when I wipe it with tissue. I have a light to medium cramping that it crawls up to my nape.

NOTE: I made a contact with my bf on my first and 2nd day of fertility window through humping without clothes. Not penetrative. No ejaculation or semen. What I am worried about is the precum because he ejaculated 5 hrs before we humped.

I need your thoughts on this. Thank you so much.