Omegaverse, mpreg, smutty

Looking for a yaoi where it starts off with MC spending a night with another man. Vision is blurry and he's not sure who he slept with. A couple weeks go by and he discovers he's pregnant but he doesn't know who the father is.

Context: they are in some fictional world with high class nobles within a military context. MC is an investigator and the 3 people he could have potentially slept with were the prince, high chancellor? And a third.

Thanks in advance!

It's probably Who's Your Daddy?.