Compress leg vein on toilet???

Ash • Be Kind.
Anyone do this? I almost vomited/fainted! I was sitting on the toilet for about 20 mins (my morning smoothie was not agreeing with me). My leg was getting a little tingly. I had to call my husband to help me. It was horrible. That's the only thing I can think it is. I'm 24wks. I have no complications and I'm pretty healthy.