Good luck with getting some recommendations. If you want to help yourself with this in the long run:
Go here:
https://f95zone.to/latest/#/cat=games/page=1/tags=225/sort=likes , have a look at stuff you find interesting and then
a) See if there's Android downloads in the OP
b) Use the search in the top right with "in this thread" for pregnancy
to check how it's implemented (it gets asked quite regularly).
But don't expect all too much... ...from what I can tell there aren't too many games here that include pregnancy for more than the endings...
EDIT1: HA! I just remembered one - and the OP states the download is Android-compatible:
https://f95zone.to/threads/hazumi-and-pregnation-v1-3-11-mihiraghi.33392/
EDIT2: And if you're not opposed to VNs and the game doesn't have to be all about pregnancy (in this case it's close to the end, but the game has a time skip and does something with the pregnant women before it's done):
Sisterly Lust (great game!)
Mrangel123 (did this so you get a ping and see the edits)