Advice please.

My husband and I have a five year old son and we are ttc number 2. I recently had my mirena iud taken out in the middle of January 2015 and we have been actively ttc since. We had a mc in March. Has anyone tried the over the counter sperm analysis at Walgreens? Or should I have him be seen by his doctor to check his sperm? What are our options and where do we go from here? Sorry for all of the questions, I have a feeling that his sperm count is low or that something is wrong on his end.