Side effects from folic acid?

I am currently TTC. For about 3 weeks now I have been taking a prenatal with 400mcg of folic acid, and then a 400mcg tablet of folic acid (because I’m pretty sure you’re supposed to get 600mcg per day?) so 800mcg total.

Anyway, ever since I started taking 800mcg folic acid per day, I have been extremely gassy, have floating stool, and get stomach cramps.

I didn’t think you could have “too much” folic acid, but these symptoms coincide with the beginning of my folic acid use so I’m inclined to think thats the reason. Has this happened to anyone else?