I think the reason for sperm life being shortened in some cases(not all) on Clomid is that it can decrease cm. If it has not affected yours, I wouldn't worry. If it has, I would try some pre-Seed or drinking grapefruit juice during follicular phase.
My doc says 6 cycles is the most he would keep me on it for. progestron level at 56.3 which is great on 50mg. but i do understand that conditions for sperm survival are limited with clomid, just thinking maybe giving it a miss this month to let them swim further, i dont really know what to do. running out of time this is day 2 of cycle.
I am not sure about the progesterone levels but just FYI my sister's doctor told her that in a lifetime one should not take more than 4-6 cycles of clomid. Just an FYI....