Will sperm motility vary in 3 months ????????

hi I am 31 years. We are trying to concieve for 2 years. I have a semen analysis done on 07/27 and the report said that I have motility 36% in that rapid linear progression is 3% and the slow non linear is 33% (abstinance period is 15 days). I have taken fertility supplement for 3 months and I have done another... show more hi I am 31 years. We are trying to concieve for 2 years. I have a semen analysis done on 07/27 and the report said that I have motility 36% in that rapid linear progression is 3% and the slow non linear is 33% (abstinance period is 15 days). I have taken fertility supplement for 3 months and I have done another semen analysis on 10/26 and the report says that motility rate is only 18% in that rapid linear progression is 0% and slow non linear progression is 18%(abstinance period 3 days) I want to to know what is the reason for the great difference between two reports. please help.
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