HI, I Don't Remember When Was The Last Time I

HI,

I don't remember when was the last time I got my periods. sept 2 is the date which i could recollect i have got my menses, since i doubt if i got it or not.
Also , my marriage is date is on 27th Jan , irregulars of periods is making me tensed . To regularize my periods i am been adviced to take t regestrone 5mg. i don't want to indulge in any chemical medication. what is can be done on this?

Thanks
Deepika