parents meeting s/o’s

So my mum wants to meet my boyfriend, i’m so fucking nervous and so is he! we’re both 18 and we’ve been together for a few weeks (not long at all) but my mums never met one of my boyfriends before so i don’t know how she’ll react, she’s very protective as it’s just been me and her forever. What do i do if she doesn’t like him? She’s quite judgemental so i have to be careful what i say about him to her.