Freaking out

I am 4w4d and I woke up bleeding bright red blood only when I wipe and now it’s turned into dark brown blood. It wasn’t enough to soak a pad or anything but I had a miscarriage in Feb so I’m just freaking out. What could this be? Me & my husband has sex YESTERDAY morning. Could that be it?

We are out of my home state on vacation and I’m trying to avoid going to the ER here.