
That is hard!
I was in the middle of my 1st loss when my cousin had her baby shower. No one thought I'd show up (they all knew what was going on) but that one I just felt I couldn't miss as she had severe infertility issues and TTC for years and this shower was for her newly adopted baby. What really helped, though, was that I let someone else buy the gift and I just paid them back.
Don't feel you have to go if you don't want to. That is a decision only you can make. You can always "call in sick" the morning of if you decide to stay home.