Should I be open with my new boyfriend?

So I recently got a new boyfriend his son is an ex student of mine so I’ve known him for a while a lovely guy hot and not classic British road man type so I’m gonna count it as a win so I hadn’t said this too the new guy but I’d had an abortion January 2nd this baby was the result of r@pe I love children but I decided to abort because I wasn’t sure if I wanted it so I bleed for about 3 days not heavy at all and turn out it was twins but only one was aborted so I’m in a sticky situation if I choose to try a surgical abortion or just keep it which I’d love to honestly i definitely want children soon and it’s kind of like a second chance to choose but I would have to tell the new guy and I’m scared I don’t want to do this alone but I don’t really want to abort again so I can’t choose now