Bridesmaids backing out, now i have too many groomsmen.

It doesnt have to be even just have 2 grooms men walk with the first and last girls

You don't have to have matching wedding parties. It's perfectly fine to have an uneven number of people on each side. Typically asking people to step down is friendship ending, even for guys as it's incredibly rude and pretty insulting (as most would see it) so unless you KNOW they really don't want to be there, I wouldn't do it. I also wouldn't ask someone new to be in your bridal party 3 months beforehand, as it becomes very clear that they're a 2nd choice, and you asked the original people because they're some of your best and closest friends or family members. No one wants to know they're on your "b" list. At this point, I think you're better off just having an uneven number of people in your wedding parties.

Asking groomsmen to step down or asking two other women to be bridesmaids at this point would be the rudest options. I'd send congratulations to your pregnant friend, understanding words to the friend that cannot afford the travel costs, and proceed with the ladies you have now. There are a bunch of ways to have them walk down the aisle with the groomsmen. People are far more important than even sides.

Neither. Just leave it. You don't need even sides.

Definitely 2 groomsmen per bridesmaid!

It's a shame that you bridesmaids are back out on you. I only have 2 bridesmaids one of them was my maid of honor and my husband had 2 groomsmen. People kept asking why we had such a small bridal party. We wanted a small bridal party because we didn't want any drama or people backing out. These were people that we could trust.

You can have an uneven amount.

I'd have an uneven wedding party, it's totally fine. We had 1 more GM than BM and I was in a wedding in 2017 that had 2 more BM than GM.