Does it make me a toxic boy mom to not be thrilled about my son's girlfriend Update

My son is 19 and started dating a girl who's pregnant. She's 23 with 3 almost 4 kids all under 5 and all have different dads. I'm not trying to judge her but my son is in college. I don't think he needs to be involved with this mess. Especially since she's already trying to make him be a father to her children. He's already met the kids and it's been a month and one asked was he there new daddy and he told me she said "Maybe!" I'm trying so hard not to be a toxic boy mom but I told him I think this situation is too much and this is too much baggage to get involved in so young. She's asking would he be willing to sign the birth certificate and cried when he said he doesn't know.

Update: He told me they broke up. It was too much stress especially while in college