I was told that after both my D&C's. This one I was told no problem, bleeding still or not. OB told me not to even worry about waiting a cycle. Mind you, I was only a little past 4 weeks, so I think they still consider that a chemical pregnancy. I think the most important thing is to make sure you are aware of any sign of infection...foul smell, etc. But if you didn't have to have meds or surgical intervention, I would not be too concerned about it.
I've been told no sex while you're still bleeding. I've haven't heard of waiting two weeks. I'm pretty sure after the bleeding stops, you're good. I've had four m/c and always followed this. Here I am, still alive and infection free. =)
I think it's after you have a D&C.
after a D&E (at 14 weeks) i was told no swimming, no baths, no sex, no tampons. hope that helps.