Yeah mine was 91/54 they didn't keep me but they kept trying to retake it thinking it was wrong.

90/50 isn't all the low if it drops below 85-80 on the systolic number I'd give your doctor a call, but I also wouldn't drive yourself if it's that low.. mine at night I'm sure drops to to 80's for a resting BP

Mine was that low and I had contractions so they admitted me

Mine has been around 95/55 lately and my doctor said its fine as long as I don't have any other symptoms. Apparently BP has to go really low to be worrisome. But doesn't hurt to call and ask.

@vitachka, call your doctor.. But I'd go to get checked out.