I had one last October - started bleeding the day period was due and had only had faint lines.
Pregnant again in November- missed miscarriage, found out at what should have been 7 weeks.
Tested positive again this August, very strong lines on test and felt really hopeful… but the bleeding started at what would have been 4 +5.
I am 40 though. I already have DC and conceived start away and all problem when a lot younger.
I’ve got pregnant this time every time we have actually ‘tried’ by timing ovulation. I think it’s just my eggs are too old 
You have better hope I think OP as you are still under 40, fingers crossed for you.
I made the mistake of signing up to Emma’s diary online, for the one that became a missed miscarriage.
I’m September I received mail from a local photographer. An invitation to enter my baby in a “beautiful baby” competition. It was hard to look at once I figured out the dates and why I’d received it.
I got another one in the post today. I phoned the photographer and told her I’d miscarried that pregnancy. She was very apologetic- but it has broken me a bit tonight, it just felt so cruel when I saw it.