What is best!?

I’m currently 15 weeks and 4 days pregnant with my ex boyfriends child, but I’m dating a new guy. He doesn’t have any kids and want to take my kids in as his own...he wants to have a family with me by this is my 6th child, he even asked if this baby could have his last name including me. I don’t know what to do because I love him and want to be with him, I’m just scared that he won’t like that I may not want anymore kids!!!! What should I tell him?!?!

Add on: my new guy been with me 1 month prior to me finding out I was pregnant