Have your prenatal vitamins caused weight gain or water retention??

PC • Mama to Cruz 💙 Kaia 💖 and Shaea to come 💗
I'm taking food based Rainbow One prenatals - I had a mmc in March, so I just started back on them as well as getting on a strict workout regimine with a nutrition plan (not diet) right after the miscarriage. 
And about a week to two weeks in to taking the prenatal and extra folic acid I got fluffy.. Extra weight out of no where. I'm on vacation in the Florida Keys for a week and worked hard for the bod, so I stopped taking them. Little by little about a week later the fluff is gone and I have my bod back. 
Is this normal? Have you experienced this? Just odd to me since these are vitamins without calories. Maybe water retention? 

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