I'm using the v1.1.1 version but it's not changing the images for the pregnant variations, not even inside the sexual encounters...
Edit:
Fixed it by using the following code in the exp_ch_stats.gd:
func is_visibly_pregnant(): if (variables.pregduration/1.5 > get_stat('pregnancy').duration && get_stat('pregnancy').duration > 0): return true else: return false
I looked at the code and added some print() logs to find the cause, and noticed that the is_visibly_pregnant() always returned false, then noticed that the has_status() func looks for tags in the character status, and the character in the save file has no pregnant tag.
Then I looked into how the pregnancy icon is set, and noticed it used the get_stat('pregnancy') func instead. I switched, and it worked.