Fucking massive if, there. Becky's suicidal ideation has always been completely performative, a BPD 'look how you made me feel, anything I do is all your fault!' standby that she brings out at the drop of a hat. The IVF saga gives her the perfect opportunity to be ten types of victim while manipulate everyone in her family to cater to her and her alone, so it's no wonder that she's absolutely loving it. I'm betting she wishes she'd thought to do it earlier, because now she has ready-made excuses to behave exactly how she wants, no matter how much of a cunt that makes her, because IVF = she's the most special person in the world.
I still believe that, no matter how much Becky has latched onto the idea of being a mother, she would hate every second of it. I'd wish on her the life of a single mother, but you know that no child would survive unharmed should Becky have to take care of it by herself, and no matter how terrible their genes no baby would deserve what Becky would put it through. Even if it managed to be physically OK, I doubt children thrive in an environment where their mother visibly resents them for ruining her life.