I read on websites that folic acid can afftect the results of a at home pregnancy test? is this true could it say positive but, really be negative?

I never heard anything like that.
When you are pregnant you need more folic acid though

How do I use a home pregnancy test?

I've been taking 400mcg of folic acid in vitamin B and I got a posative test yerterday and today I just want to make sure the folic acid didn't affect it

No, the folic acid did not affect it. You are most likely pregnant. Every woman of child bearing years should take folic acid daily to prevent neural tube defects should a woman become pregnant and not know it.

It is refreshing to see that you are taking folic acid and VB prior to becoming pregnant. Good for you!! Now, make a doctor's appointment Monday morning for a prenatal screening to include bloodwork. Looks like congrats are in order.

Thank you very much yes I started taking them I wanted to make sure nothing would happen to my unborn child so thank you for your help!