TTC ovulation regularity

Tiffany • 28 | married | momma
Hey ladies,
Any tips on getting your cycle regular again? I used to have mine like clock work until I went out of the country for three week in September of 2016. 
My cycles have been crazy as follows:
96 day cycle (no miscarriage)
45 day cycle 
47 day cycle 
32 day cycle 
Most recently, my first day or my last period was April 22nd and I've had three negative pregnancy test within the last five days. Does anyone have any tips in getting a regular flow again? My husband and I are TTC and it seems impossible at this point!!