If you've not had a semen analysis at all, or within the last three months, then you need to consider having a series of semen analysis performed.
To Get Answers, You Need a Semen Analysis
Why do you need a semen analysis? Because it is the cornerstone for establishing male fertility. And your fertility is an important factor achieving a successful pregnancy as a couple.
So, just as your partner's female fertility factors need to be tested and determined, yours do, also. And the first step is the semen analysis.