Discussing a 4th while still pregnant? Trying for opposite gender.

Background:

I’m 37 yrs old, currently 5 months pregnant with twin girls. My husband is 39. We have a 5 year old little girl.

To be honest , my husband and I have experienced huge gender disappointment ever since we found out the twins were both girls. (Please don’t judge, I’ve read others feel the same way for a bit). I know these feelings will pass & we’re going to love them regardless ❤️. We believe they are huge blessings to our family.

The reason being for gender disappointment, is we feel like we’re both getting older & it’s too late to try for a 4th?! 😌 or is it?

However, we just casually brought up trying for 4th right away & even possibly trying Gender Determination. I’m having so many mixed feelings. Plus I’m caring these beautiful twins & I just want to be happy. I don’t want them to feel any bad feelings.