Something's Wrong

My cycle was only 19 days again. Well, 20 I guess since yesterday was just spotting. That cant be normal, right? We've been trying for 2 years now... My cycles have never been so short. I had bloodtests done in November and everything came back normal, including progesterone... But why are my cycles so short? OPKs say I ovulate, though apparently I didnt last month (and that was WITH CLOMID). This cycle I'll be taking 100mg of Clomid. I'm just so frustrated and sad and, to be honest, afraid that there is something very wrong with me. I will be 36 in February and have no kids. I got married at 33 and did manage to get pregnant 2 months after the wedding (and 1 month before my 34th bday)...but miscarried very early. It can't be too late for me, can it?