I had a lot of bleeding when pregnant with DS (from 6-10 weeks, from 12-20 weeks and from 30-33 weeks) and ended up giving birth at 42 weeks. It was sometimes accompanied by cramping, sometimes not and varied from brown, to bright red to clots.
I think I had anything up to 20 scans during my pregnancy. A lot of those were due to me taking myself to the walk-in emergency gynae dept at St. Thomas'.
When DS was born, my midwife told me that his placenta was in very poor condition and it looked like some of it had broken off in utero. At about 15 weeks, my obstetrician thought she could see a subchorionic haemotoma on the scan.
It's really hard to stay calm as you immediately assume that bleeding = miscarriage and I spent the entire pregnancy petrified. I don't think I could have been any other way, but it definitely impacted on my state of mind post-birth.
If you find it reassuring (I did) keep on going to your EPU and when it gets to a bit later on in your pregnancy, it may be worth investing in a heart monitor. Some people think they are more trouble than they're worth, but DS was always pretty much in the same place and I found it very reassuring to be able to listen in when I wanted to.
I found that prior to 24 weeks, the people I saw were not terribly supportive - I was just quite pushy about wanting everything to be checked out and tried not to take anything to heart.
I'm now 21 weeks pregnant and have had no bleeds thus far.
Good luck with the pregnancy.
BTW, I was told by a doctor recently that once they have seen a heartbeat on a scan, there is a 94% probabliity that you will carry a healthy baby to term.