Men's Fertility

Hi, I'm 33 and my husband is 38, soon to be 39. I have 2 kids, ages 8 and 11 from a previous marriage, both of which were conceived very easily, within the first month of trying. He has no biological children. We have been ttc for a little over a year now with no luck. I have very regular periods every month. We haven't went to the doctor yet but are planning to make an appt soon as time is not really on our side :(

That being said, we are not sure if the problem lies with me or with him. I have seen women on here post comments about taking Clomid and other medications for fertility, my question is is there anything a man can take to boost fertility/sperm count.