Hey
I know how you feel because i lost my baby to stillborn in december at 34 weeks and i miss him so much, and would really love to have another baby.
What i can suggest is to relax, it is hard i know, but if you keep trying to hard it won't work as because your be thinking to much about it, your make your body thinks its already pregnant.
My mate done this as she really wanted a baby and make her body think she was, so she didn't come on her period and even got stretch marks, i know it sounds weird but it can happen.
Just try out different things in sex, see if that takes your mind off things, and as soon as you've had sex, lay down for 20 mins, have a cuddle with your partner. Sorry i cant be more help.
Good luck xxxx