Just told Friends & Family my 19 year old fiancee is pregnant?

And my mates are mocking me. They're driving her mad by asking her 'Who's the dad'? And 'How'd Lennon even stick his thing (I think you know what I mean) in you'? They are already pissed drunk and it's only 1/4 to 9. What should I do? And they're saying she only agreed to marry me because of my money. Should I make them go home, but it's my birthday party, and my family are leaving to go bowling so it'll just be teens & peopls in their 20's here, and they'll liven it up. Should I just take no notice because they've been drinking since 4pm.