Pregnant bridesmaid

I’m in a wedding this weekend, January 4th in Ohio. It’s supposed to snow the rest of the week and be freezing this weekend. My friend wants outdoor pictures and wants us to wear our dress shoes instead of boots. I’m 8 months pregnant and I’m concerned about it being icy and potentially falling. I’m not sure how to approach the situation and basically tell her I’m not wearing my dress shoes outside. My heels are very short but my feet are swollen and it’s still hard to walk. My dress covers my feet completely. I feel like it’s a safety issue and I’m not willing to risk it. Am I being ridiculous?

EDIT:

Thank you for all the responses, I didn’t expect this to get so many comments. And hurt for reference this was Cleveland, we had a polar vortex this weekend with lake effect snow from Friday - Saturday evening, it snowed almost all day Saturday.

UPDATE: The bride didn’t end up having us take pictures outside. The bride and groom took pictures outside but the bridal party was on and off a party bus and I had plenty of help getting around when we did have to walk outside, so it ended up being a non-issue. I also ended up getting different shoes that were closed toed with an even smaller, and square heel, so I felt safe walking short distances outside since we weren’t outside for any significant amount of time. I didn’t fall and everything worked out.