​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​i have just been told i have gallstones since having baby#1. my af is due tomro. but as ive been throwing up. can it give you a false positive