Trying to be supportive

I'm trying so hard to be happy for my two friends who had babies in the past couple weeks, but I'm so depressed! By now I should be showing, everyone should know, and I should be blissfully happy. Instead I'm hiding out so I don't have to deal with people, trying to deal with the fact that I lost my baby and haven't been able to conceive since. I've been trying not to think too much about how far I'd be now, but when friends are having their (unplanned) babies and my planned and very much wanted baby is gone, it's really hard. Not trying to whine, I just can't say these things to anyone.