i have not noticed any drastic weight change like that but i have noticed im starting to retain water in my legs....i had the same issue when i was preg with my son....i gained a drastic amount of weight in the 3rd trimester but i lost it quickly after he was born
i would def bring this up to your doc and see what they say
Sometimes it is just like that. Perhaps you've weighed yourself after drinking alot or a big meal. I always weigh myself first thing in the morning before breakfast.
My bp and all tests have been normal but i've been keeping a close eye out for excessive swelling.
It is normal to start having water retention, if you're drinking alot that can make a difference but talk to your OB about it as massive flunctuations in weight within the day may be due to preclampsia. Is your BP normal or elevated?