Please help me to choose the best product for me!!!

Hi! I'm from Costa Rica.

I would like to know which products are best for me, Fertility monitor or ovulation test?

I have tried to get pregnant for more than a year. My husband is going to have a varicocele surgery soon.
Now, I would like to have some help when my husband getting well. I have a very irregular cycle, for example my period came January 30 th and then until march 23th. The last period took just 2 days, when the others took 5 to 7 days.

What would you recommend?

Thank you so much!!!