Preeclampsia?

S • mama to a babygirl 💗 expecting baby #2 in May 💞

I’m 15 weeks 4 days and was just reading about preeclampsia to be on the safe side so I know what to look for. I read that preeclampsia usually happens after 20 weeks, and that the treatment is to delivery the baby. Is this seriously true??? So if a woman was 22 weeks pregnant and developed preeclampsia they would deliver the baby? Anybody know more about this than what I’ve read? I tend to read one thing on the internet and believer it lol