I totally agree. Get the support where you know you can get it: your family. Don't count on the guy to do anything for you, especially if he already has multiple children from multiple women. After me and my daughter's father split, I found out he was getting married, that girl had a baby, and then about a year later, he had gotten kicked out and was with a third woman, and she just had a baby as well! So, within 3 years, he had 3 kids by 3 different women... I'd rather him NOT be in my daughter's life, but he is - every other weekend and he pays child support (sometimes).
The point is, don't stress about the guy - you're pregnant, so do what you gotta do for you and the baby and F-him if he runs the other way, kwim?