For some reason, off and on throught out this pregnancy ill feel really weak to where i have to try…

For some reason, off and on throught out this pregnancy ill feel really weak to where i have to try and stabalize myself so i can walk. Sometimes it'll go away fast after i sit or lay down for awhile amd sometimes itll go away just for a minute tillvi start doing things (like cleaning). Really weird. Also my eyes would be lazy feeling and a little hard to focus...