SO is tired of tests

My husband and I are trying for #2 and when we started he said he didn't want to go through a bunch of tests, that I will just know when I'm pregnant and then we will take one before going to dr. I have very irregular periods can go 6+ months without one which is why before we got pregnant with our son I was always taking them when I would miss a period. Well now I'm over 100 days late. Last AF was in Aug and we started trying g 3 weeks ago. Don't know when to test! I didn't have any sign when I was pregnant with our son I just decided to take a test since I was 3 months late and expected it to be negative