I've been using the last few cycles and so far nothing, i've heard of it working for other people, i guess it depends on if its lack of EWCM stopping you falling preggo.. i don't seem to have much myself so really though Pre-seed was going to be my miracle, but so far nothing, but using it again this month, you buy it online.
If you'd rather you can but a lube in boots called conceive plus, its the same sort of thing but its meant to be better than pre-seed because it contains things that actually help the spermies survival and from what i've read, i the pre-seed just doesn't kill the sperm like other lubes but doesn't have extars to help them like magnesium and some other things can't remember then now.. no luck for me with either though! GL x