Boyfriend wants me pregnant...

We've only been dating 2 1/2 months. He's 25 Im 22. He wants a baby with me so bad. One of the reasons is bc my daughter is 2 and he wants our kids close in age. I want a child with him too it's just so soon. I'm 3 days into my fertile window and he wants to finish inside me tonight. No mean comments please, just want thoughts on the subject and if I should let him.