Need to know about the folic acid and my missed periods

I juzz used the folic acid from one month ago and now i have missed my periods its about 4to 5 days late and all of the above i have no sign of symptoms i means that is but not bold i have really bad cramp in my belly and my legs i feel like i am on my periods but when i went to sleep all is good and nothong happened. When i used the folic acid my body feel temperature and i had also fever in my last 2 weeks. I messed up with all of this happening today i checked my pregnancy... Hope so it will be positive.. What you guys say the 1 month of taking folic acid is enough for my body for pregnancy