Sorry to hear of your loss Mazza, and those of the other girls - but it's great to read about the happy outcomes of subsequent ttc!!
I have also heard that you are more fertile right after m/c, because your hormones have been given a bit of a kick by the pregnancy - but this can also mean that your cycle gets thrown out of kilter, so if you were lucky enough to have regular-as-clockwork cycles and know when you ovulate before your m/c, timing can be a bit trickier for a couple of months afterwards.
Mazza I am in the same boat as you, natural m/c began 5 days ago and seems just about finished now. My gp said that as it was a very early one, it was fine to try again straight away as soon as bleeding stops, and it shouldn't have any negative impact on the next pregnancy - but agree with Rebaby that the advice can be conflicting!
We conceived in our first month of trying, which was a surprise to say the least - so hope it won't take too long a second time, but I can imagine how hard it must be if you have been trying for a long time.
As for OPKs, I also read that these can be misleading in your first month after m/c, before your next AF, because of hormones going wild. But then again I have read posts on here from people who got pregnant straight after m/c by using OPKs! So who knows...?! It's so frustrating !! especially if you're a control freak like me....
good luck to all! xxxx