I have a 10-12% chance of conceiving, what are my odds of conceiving if my partner has a high or low sperm count? How do we find out his sperm count?

?? It's unclear where you got the 10-12%. Based on age, you would have about a 25% chance per month for a normal couple. To check the sperm, he needs a semen analysis, and it is best to have it done at a fertility center for the most accurate results.