Should I stop talking folic acid?

I had a routine endoscopy before Christmas to check my stomach as I’m gluten intolerant and have been on a gluten free diet for around 14 months. During the endoscopy they found atrophic gastritis and biopsies were taken. I had a B12 test and folate. My B12 came in at 225ng/L and my folate at a very low 1.5ug/L. I was prescribed 5mg folic acid. This was about 2 weeks ago. Since then I’ve fixed my diet which was terrible. I hardly was eating any veg or meet just chocolate and bread.

I’ve also had some blood tests done for pernicious anemia but I’m yet to receive the results. However, I’ve received the results for my resent B12 and folate and to my surprise my B12 is now 429ng/L and my folate is at the top of the range at 24ug/L. How is this possible after only 2 weeks?

I’m now thinking should I stop the folic acid supplementation?