Should I be worried?

Hi! I'm 23, my husband and I have been ttc for 6 months with no luck :( I know it's early to be worried that one of us has a problem but if you can share your knowledge to help me calm my nerves

My husband is 30, he had his sperm tested 3 years ago and the results were very good

I have had regular periods for as long as I can remember, never missed a period and it's never late (maximum 2 days late)

I have never used birth control pills or took any hormone-affecting pills

I'm a working wife and my job can get a little stressful

This month was the second time using opk and I got a positive result (last month I didn't test everyday and I think I missed it)

Is it still highly probably that me or my husband have a problem?