I haven't had it, and I'm not a medical professional-
but- I'm being monitored for high bp (and on bed rest), and they told me that it's upper abdominal pain (usually upper right quadrant)- caused by liver issues. Said it would be pretty darn uncomfortable. (also watch out for the sudden swelling, decrease in urine production, bad headaches, vision problems, etc.)
However, pre-e isn't something you want to mess around with! I'd call your doctor if you're concerned!
https://www.preeclampsia.org/health-information/sign-symptoms