Period question

Samantha • My name is Samantha of course. My amazing husband is luis. We are trying for my 3rd baby his 1st. I have 2 little boys that luis loves with all his heart too. He is the best man in the world.
Oh my husband and i have been ttc since August 2nd (hubby's birthday) every since we have tried my period has been coming late and longer. Usually I start at the beginning of the month like the 5th but not its the 16th and later. And I used to go 3 says now it is 5 to 6 days.