3rd trimester TMI alert... LOL

I've got an Ob appointment in an hour but I was just wondering if anyone had an experience with brown-pink spotting at 34 weeks? It's only there when I wipe, started last night as only the tiniest bit of brown on the toilet paper and happened twice, once in the afternoon and another just before bed. Then this morning each time I got to the toilet there is none on the liner but always some on the toilet paper and it's usually between brown and light pinkish in colour and comes out with stuff that I wouldn't describe as snot-like (like I imagine the mucous plug would be - I never saw it last time so I have no idea what it's meant to look like), more like lint-like - not hard but sort of clumpy. Gosh, this is so TMI, sorry! I also had a growth scan on Tuesday. It was't internal but could that have triggered spotting?

Baby is moving reguarly. I've had sporadic cramps and backache since Saturday, Saturday was the worst as it was accompanied by 30-60 tightenings that were regular every 10 minutes almost all day (but not getting any tighter than usual so I wasn't concerned) and it has gradually got better since then, but then considering I'm 34 weeks I don't find it terribly unusual.

Would you just keep an eye on it, or tell the Ob. I've been trying to decide if I'll mention it to the Ob today. I don't particularly want to be sent to the birth suite, as I'm fairly sure all is fine.