Just got home from hospital, called and went back an hour or so after posting this, had bloods and a swab taken and will be going back early tomorrow morning for an ultrasound.
Drs and midwife were much more thorough this evening and explained things better.
Suggested I stay the night, which I wasn't too keen on, but they were ok with that and just told me what to look out for and stressed I come in if anything changes. (said they wouldn't do anything tonight anyway, would just be to monitor bleeding, and get blood results back which they can call and it'll take me 15mins to be there anyway, and bubs hb and moments are perfectly fine)
Dr said bleeding had seemed to have stopped and the clots were just what was sitting up high inside and not so much bright red fresh as what was before.
She couldn't see where the blood was coming from, hence the ultrasound, said it could be from a spot on the cervix, placenta, or uterine wall, but unlikely to be bloody show....as there was just too much blood.