Ovulation Testing

Aimee

So we have been trying for baby #2 for about 9 months and nothing. My cycle used to be very regular and I knew when I was ovulating, but the last few months it hasn't been. I want to start ovulation testing this month, but at what point after my period do I start testing? Any insight would be helpful! Thank you in advance! Also, I am in my 30's and my husband is in his 40's.