Pixie hooray!!!!!!!!
huge congratulations to you and RNC, hope you're both doing well and enjoying lots of snuggles, sorry to hear things didn't go to plan though but brilliant news that she's out in the world now!

Mabel I'm no doctor but I was thinking that it could be a UTI, do you have any UTI-ish symptoms? Is it worth seeing your doctor for them to test your wee, so that you can rule it out? I remember our midwife saying that UTI's can cause bleeding, little bits of cervical tissue loss and all other sorts of worrying, but usually harmless things. Also, and again I'm no expert, but if it comes out when you're straining, it sounds like something to be less worried about than if it was just coming out all the time, if that makes sense.
I had no symptoms at 5 weeks pregnant at all (didn't even suspect I was pregnant, and I'm usually really hot at symptom spotting!) in fact didn't have any until hyperemesis kicked in at 7/8 weeks, and even then the hyperemesis was the only symptom I had until the second trimester.
With the pregnancies I lost I didn't get any reduction in symptoms, but with this one they vary on a daily basis (since the hyperemesis seems to have gone, touch wood!) I seem to go through phases of symptoms, sore boobs for a few days, then sore back but boobs fine, then heartburt but back and boobs fine etc etc.
In this pregnancy I've had bleeds, tissue loss, clots coming out, agonising cramping pains, more blood loss...the list goes on and I've lostcount of the times that I genuinely thought we were losing our little bean, but (touch wood) everything was ok, so just because something seems worrying doesn't mean it's bad news, everything is far, far more likely to be absolutely fine than not.
As you say, give your doctor a ring for peace of mind, they may be able to do an earlier scan. Hold on to the positivity, today you are pregnant. x.