Help!!

So my period is supposed to start in a day or two but this morning, when I wiped, I noticed like brown discharge on the paper. I don’t think this has ever happened to me and I’m really freaking out about it.

I am sexually active but the last time I had sex, I took plan B the day after because my boyfriend was really worried because something felt “off” with the condom.

Any advice about the brown discharge would be helpful! TIA