Ok, let's assume Betty is pregnant. Let's use our soapy heads to think about the scenarios that could take place...
Robin finds out she can't get pregnant because of her working with radiation antidotes. She's sterile. Meanwhile, Betty is all glowing with a baby belly and Emma is so happy to have a brother! Patrick tries not to get excited but..you know he is...
Sabrina gets trapped in a snowstorm and Robin has to deliver the baby. and Sabrina either Dies (and people think Robin did it on purpose) or lives and Patrick/Emma are forever in her face with the baby. She gets depressed, maybe leaves. Maybe puts the baby boy in a tree.
OR..Robin gets pregnant the same time Sabrina does. They have boys. Sabrina gets murdered and Robin has to raise both boys as her own.
ie: Monica/Susan redux
OR..it's really Carrrrrrrrlos' baby because he lied and they did sleep together. Which would make it a rape but since when did that stop anything? We don't find out it's his baby until the crisis hits Robin/Patrick and they are on the brink of divorce....
OR...Sabrina says it's Carlo's baby to 'save Patrick' but lives in angst that it's really his. Of course the baby will need a transplant or other life-saving stuff and the truth eventually comes out.
OR...it's Patrick's baby and Robin has to save it in some fashion when it comes down with a rare virus...one that threatens all of Port Charles.
OR... Robin accidentally knocks Betty down the stairs at either the Qmansion, the docks or the hospital. Sabrina loses her baby. Everyone blames Robin, even Patrick.
OR..Kim decides to leave GH again--Robin is "killed" or "goes to do research" or.. you choose and Patrick has to find his way back to his Betty baby-mama
YOU have any ideas? You know there's a million.