Boy am I happy my mother didn't say anything about me having reptiles when I was pregnant.. I would have laughed at her.
There are many many reptile enthusiasts who have new (human) babies while carrying on their passion of keeping/breeding snakes.
I see the announcements and photos of these new babies on FB all the time. Posted by reptile people. Your friends GF is being ridiculous.
I have a friend right now who is due in a few weeks. She and her husband have some pretty big reptiles including a monitor I wouldn't let near a baby. It's called responsibility. Their pets are their family too..
In my opinion, you are not a good and responsible pet owner if you are willing to just "get rid" of certain pets just because you're pregnant.. That's pure ignorance in both definitions of the word. To say you care about your pets and then be so carefree about getting of them just because you're having a baby is wrong. It's not like they're losing their house, or living somewhere they're not allowed, or some other completely unavoidable reason.
To a person like that I say they should not ever have pets. "They" being generalized.
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Snakes, Jeeps, Dragons, Nature, & Knives.. Makes my world go-round!