When will I be ok again?

It has now been a month since I found out I lost my precious baby and had my d&c. There are days that I'm completely fine but then there are days like today that I'm at a baby shower for a sister in law and I'm fighting tears and depression. It's not that I'm not happy for her and others that are pregnant because I'm so excited for them but it hurts because I know that I don't get that and have to try again and wait. The pain hurts so bad and it's hard to talk to anyone about it. It hurts when I have people say right to my face that their family gets pregnant so easily when it took us awhile to get pregnant. When will I stop feeling this pain? When will it be ok for me to be around those that are pregnant, especially those that weren't even trying and didn't want a baby? When will I stop feeling this pain? When will I be truly happy again and not be depressed all the time? Sorry for this but I had to put how I felt out somehow.