Brownish pink discharge day before “ovulation”

Kia

So my husband and I have “stopped trying” this month (still have the app, still check it a lot, don’t take opks) so we had unprotected sex 4 days ago, and then we’ve been apart since. According to the app, I’m supposed to ovulate tomorrow. I know it’s not exact. But I had brown blood this morning and now it’s a little pink. It’s more than a panty liner, but less than a pad, if that makes since. Is it just ovulation bleeding, probably? I’ve never had this before.