Hello.. My Boyfriend And I Have Been Trying To Have

Hello.. my boyfriend and I have been trying to have a baby for almost 5 years. My concern is that he is taking 3,000 mlg in keppra and 1,200 mlg of tegretol a day. And also 1,00p mlg metphorman for diabetes. Are these meds cause a low sperm count. I kniw its not me I have had 2 childre. Previous to meeting him. Any suggestions on what to do.... Thanks in advanced