Unfortunately there is no way to find out yourself. You will need a doctor (Normally a fertility specialist) to run the test and determine if you are fertile and how fertile you are.
There are things you can do to improve your odds, such as wearing boxers to increase blood flow. No spoke or do drugs. Alcohol will slow things down as well. Make sure you are eating a balanced diet and getting the correct amount of sleep.
If you suspect there is a problem you will need to speak with your doctor about running the tests.
I wish you the best.