TTC for 15mos

Meghan
Hi ladies 
After 15 mos of TTC i am overwhelmed an upset AF came today. I havnt used ovulation kits or done anything I don't have anyone to talk to about this. I'd love some in sight on what you girls have done or have tried. If AF came today when should I use the ovulation kit? Once I'm off my period when do I start doing the ovulation test