Should I still check at the doctors?

I’m 36 weeks tomorrow and my discharge has been a bit off colluded but yesterday it seems to have blood in, not bright red just like brown blood. I rang the hospital and they said they would only be concerned if it was bright red which it isn’t and if I had pains which I don’t. They said I can get a swab done at the doctors. So I’ve made an appointment for today but I’ve woken up with nothing on my panty liner, no discharge through the night or anything. Should I still mention it to doctor and get a swab done today?