dunnitt there are a few of us here with later losses unfortunately. They are rarer, I read statistics anywhere from 0.5% to 5% happen in the second trimester - I think it depends on when you define the trimesters really (some say 12 weeks is second tri, some say 14), and if you count termination for medical reasons in those statistics, or not (not belittling this, I just think it's in a different set of stats) and if you 'count' MMC - like a MC found at a NT scan for example. Second tri MCs often have different causes to first tri MCs, and I've found they are taken more 'seriously' by the professionals as worthy of investigation...probably because they can sometimes do something to fix it/save future babies, whereas for the majority of first tri MCs there's so sadly nothing to be done.
Having said all that I fall in the nothing-to-be-done category. I don't have any official diagnosis, as I would need to have investigations when not-pregnant. And I always seem to be pregnant when I go in 
but the theory is I have a uterine malformation (bicornuate uterus) which causes placental abruption as the uterus expands - but I have carried my DD to term plus some and had a healthy straightforward home birth, so it seems to be pure chance on where the placenta ends up.
Why my waters broke at 17w with my DS will always be something of a mystery but it may just be my body deciding it wasn't going to carry a pregnancy destined to fail - I had had bleeding and brown discharge/fluid from 13+3 with no reason found on investigations. It is likely the placenta had begun to come away from the uterine wall. But the placenta (and DS) were otherwise healthy, killed by infection after ROM, and born by induction of labour 2 days later.
If my waters hadn't gone it's highly likely DS would have been a MMC at the 20 week scan.
My 14 week MC was discovered on a scan in my 13th week - we had told our families I was pregnant on Christmas Day after dating scan at 13w on Dec 22nd, bled on the 28th and went for another scan, baby was gone. Went home to wait and baby was lost the first week of January, that was my worst and longest labour, it wasn't helped by the medical definition of 1st/2nd tri MC - my baby died at 13+6, meaning it was a 1st trimester loss, so I was alone at home with the suggestion of paracetamol and a bath. With my DS I had labour ward, a midwife and could have had any pain relief I required - I really should have tried some for the craic 
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Sorry I'm going on and on now
It's rare. Later losses are rare. Honest they are, it's just hanging round these parts makes it seem like they aren't. 14 weeks - 28 weeks is actually one of the safest bits of pregnancy. I won't say it doesn't or won't happen, but don't let us take your milestone joy. I'm 13+2 today and there is EVERY chance that even I will have a healthy baby at the end, so don't worry.
I'm sorry for all the metalling. Fingers crossed for all the scan news today. XXXXX