Sophie so sorry, do kind of know how you might be feeling.
As soon as you get that line, you can't help but mentally plan ahead...I had mc in may at 6 weeks, and got a bfp on Thursday this week, but am sat in bed cramping, heavy bleeding with a hot water bottle on my tummy.
The whole thing is crap and so emotionally heart wrenching.
All I can say is take care of yourself as much as you can, mums net has been a life saver to me, and the support is fantastic.
I counted the first day of bleeding as day one of new cycle? not sure if thats exactly right, but things returned to normal quite quickly. Was advised we could ty again whenever we were ready, as long as I got a -test. The whole waiting one cycle is for dating only really, and if loss is early and complete it should be ok.
Sending you lots of hugs, and hope you can talk to your BF soon.
XX