Bloody discharge?

So I've been having a tiny amount of brown discharge the last couple of days, nothing to really worry about because it genuinely wasn't much at all but today when I went to the bathroom there was a bit of blood when I wiped. It wasn't a huge amount but I'm scared because my nausea symptoms have also gone away and my midwife couldn't hear the heartbeat when I was there (although that was at 10 weeks). I'm still exhausted but i can't help but worry. I have my first scan in 3 days on my 12 weeks, do I hold out to see if everything's okay and try to stop worrying so much?

UPDATE: I called my midwife and she basically told me there was nothing they could do, that if it got heavier to go to ED but otherwise just wait until my scan on Wednesday.