@Umang01
I am so sorry your husband has turned into a massive shit over this!
Please do exactly what you want to do.
In your shoes I would keep the baby. I've had a lot of IVF/IUI/Fertility treatment etc and one thing I know is it is all very intentional! So, was your husband was cooperating with all this but not wanting a baby? If so, that is ridiculous of him.
Maybe he just got caught up in this long fertility journey and he felt he could not cope. If so, then maybe counselling could help. For him. And if things change. So be it.
I know you have a concern it may be twins but even with IVF that is still quite rare.
But either way, your husband is financially responsible for the child.
It is possible to do this wholly on your own if you want to, but personally, I think your husband should pay his fair share towards his child.
You can resume your career, and the baby's dad's contributions would help with the costs of raising a child.
Whatever you do, make sure it is your choice.
XXXXXXX