Next step !??

Hi my name is Aly and I am 27 years old as of October. I have officially decided that I unable to conceive !? “Self diagnosed”

At the age of 16yrs old I was in my first long term relationship for 3yrs. I then got in a new relationship for hmmm only about 4months. My next relationship was almost about 4yrs and I am now in a relationship with my fiancée going on about 16 months. Well long story short I have never been on birth control. Never ! Not once have I got a scare or I thought or believe I might have conceived. My periods have always been regular. Maybe a late by a few days but normal, for me. I thought it was maybe the guys but after the breakups, maybe within the months past after the breakups my ex’s had became fathers. So the past 2yrs I really started to think and believe it is me... what is my next step !? Where should I go from here !?

Thank you !

Sincerely

Aly