Bero... Will email tomorrow (about to go to bed). Are you emailable again now? (If so, that's pretty impressive. I only moved across the road last year and it took me two months to get my internet working!)
Try not to panic (ha ha!). Placenta praevia can be serious, but if your placenta is only touching the cervix, not covering it, then it is very likely that it will move and you will be OK. I had grade 4 pp when I had M and was told that my placenta was 'sunk in my cervix like a plug in a sink'. OTOH, when I had E I was also told that my placenta was 'low' (they didn't want to be specific) at my 20-week scan, but it had moved by 34 weeks when I had another scan, and I went on to have a problem-free VBAC, so although I had a very dramatic placenta-related experience first time round, I am also living proof that it doesn't have to be like that.
I haven't heard the thing about not bf-ing (but then, I don't suppose they'd have mentioned it to me, because I wasn't actually bf-ing either time!). It does sound plausible (that the mild contractions might affect the placenta if it's very low), though. Sorry, I know that's not what you want to hear, and someone better informed than me might come along and tell you otherwise. Did they tell you to avoid sex? I think that may be for the same reason (just as sex/nipple-twiddling can induce labour).
I really don't want to be alarmist, but if you do bleed again, go straight to hospital (do not pass 'Go', do not collect £200!). It will probably settle right back down again, but better to be safe than sorry.
Sorry... I'm not the most reassuring person to talk to about this, as my experience was rather extreme. However, try to think about what happened when I had E. No problems at all and a lovely simple birth. No reason at all why this shouldn't happen to you.
Glad the flat is looking good. I hope you'll all be really happy there. Hang on in there, and take it easy...
Thinking about you. (((())))