What can I do to help regulate my period?!

So we’re TTC our first baby, however my periods have ALWAYS been really light and irregular and last about 3-4 days. Also, I was on the Depo BC for almost 6 years and would only have light spotting once every couple of months but I’ve been off of it for maybe 2 years. Idk if that would have/still have an effect on my ovulation and period. (Obviously, I know birth control stops your period lol) I was wondering if there are any over the counter medicine/vitamins I can take to help regulate my period so I can track my ovulation better. I’m already taking prenatals! Thanks in advance! So sick of crying every time I get a BFN! 😭