I Have PCOS, I Get IPL Hair for Bikini Area and Get my Periods Every Time After the Treatment?

i have PCOS,irregural periods,i have had 4 treatment of IPL hair removel done to my,full bikini area,almost full body.Now i normally get my periods every 3 to 4 months later. however i have noticed that everytime i get the IPL treatments done on my bikini area i start getting my periods on the same day,i have the treatment after 4 weeks or 6 weeks.after some treatment i got spot bleeding for 10/11 day and other time i got my normal heavy periods.is the bleeding because of IPLor is it my period.