Will Bulbous Nose After Pregnancy Return to Normal?

It’s unusual for patients to experience changes in nasal shape following pregnancy. When these changes occur they’re usually always related to swelling. Under these circumstances the nose usually returns to its pre-pregnancy status as the swelling resolves.

                In someone who’s one and half years post-pregnancy these changes are probably permanent and correction will probably require rhinoplasty surgery.

                Your history is unusual and for this reason consultation with a board certified plastic surgeon is appropriate. There’s the possibility that your nasal changes aren’t related to your pregnancy and other potential causes should be investigated. Depending upon this evaluation your surgeon should be able to formulate a treatment plan that addresses your anatomic findings and achieves your aesthetic goals. 

This is a complication that can occur but infrequently, the enlarging of a nose post pregnancy.
I first would like to see any photos of your face pre-pregnancy, then compare more recent photos. I bet you always had some widening and bulbousness initially. The pregnancies just enhanced the appearance.
Your ONLY option is rhinoplasty. So go see 3 boarded Plastic surgeons.
Regards

Since it has been a year-and-a-half after your last pregnancy, your nose is probably in a permanent state at this point. The bulbousness and bifidity is unlikely to go away at this point and your nose will not return to its pre-pregnancy shape. A rhinoplasty would be your only solution to improve the aesthetics of your nose.