When to see doctor, does my husband have low t, just want a baby...

Hannah

So my husband and I have been trying for a baby for about 6 months now with no baby thus far... I was on birth control for about 6 months before my wedding and my periods were super irregular before I started it and while I was on it. Now that I’m not on it they are perfectly regular. My husbands sex drive is very low at times and he’s extremely tired most of the time so I worry he has low test. I know it’s only been 6 months and no doctor would see us but I just wanna know that we both are able to have children and I’ve also heard of preconception checkups?? Is that a thing??