Great news and I'm really glad that your scan gave you some (much-needed) reassurance. I don't want to freak you out but it's worth considering possibility of a repeat bleed, especially as your placenta is covering your cervix - this does put you at a high risk of bleeding and it's important that if this does happen you hot-foot it to hospital.
I had placenta praevia with my twin pregnancy, which was diagnosed at my twenty week scan. Oh well, thought I, as my consultant outlined the risks....but then I bled from 23 weeks onwards with increasing regularity and severity. The bleeds triggered labour at 23 weeks (dire), 25 weeks and 30 weeks, all of which were blocked with drugs as soon as I got to hospital. I was lucky. From 30 weeks they kept me in hospital until I had an enormous bleed at 35 weeks. My daughters were born well and healthy at 35 weeks.
I don't want to scare you as it sounds as you've been scared enough over the past week. I actually think it's very reassuring that this has been picked up as consultants/midwives will now be ALL over you and your delivery will be very well-attended, which is no bad thing. However, it's good to have an 'emergency mindset' for the bleeds; a plan of action if you like. Until I was kept in hospital I carried my notes with me everywhere (even though they were like a book by the end!) and always had my mobile on and juiced up in case I needed to call an ambulance. I also had what I called my 'bleed bag' at home, which was always packed for a last-minute dash to hospital (a nightdress, some mini toiletries, a book, flip flops, a cardigan, etc. Stuff to get you through a 24 hour stay...). So if I did start to bleed there was minimal faffing around. I'm glad I did as at my 23 week bleed I was already going into labour by the time I got to hospital (20 minutes) and it was a bet as to whether the drugs would block the labour or not. They did, thank God, but it was a bleak few hours on the labour ward whilst we waited to find out.
The fact that you've been diagnosed is really reassuring but please get lots of rest and take things as easy as you can. THere is no guarantee that you will bleed again, but there is evidence to suggest that the easier you take things the less likely it is. THey call it 'pelvic rest' and it's really dull (no sex, no orgasms, no lifting, no exercise, etc.) but it does mean no hoovering, which is a bonus in my view.
Wishing you the best with the rest of your pregnancy. Placenta praevia is really scary but once they know about it you're in very safe hands and get very well looked after. I always felt in very good hands and I got through - womb intact and am even considering another pregnancy!.
Take care.
K