Lube isn't really going to help you conceive anyway though darling... it's more just to help BDing easier if you aren't very moist.
Just saw an interesting article about Preseed on this website, which after reading it my suggestion is if you don't need it- don't use it.
http://www.baby4you.co.nz/Lubricants+and+Fertility.html Here is an excerpt:
"In fact, several studies show that several well-known products, including KY Jelly, Astroglide and Replens actually KILLED SPERM EQUIVALENTLY TO CONTRACEPTIVE GELS.

For example, this graph shows sperm motility at ZERO after contact with three popular lubricants as reported by investigators at the University of Texas Southwestern Medical Center (Kutteh, et al., 1996).
Resent research has also shown an actual and severe decline in the ability of embryos to form when sperm are exposed to one of the leading personal lubricant brands during in vitro studies using a bovine model. (View abstract here)"
It is basically hawking Preseed on every webpage. But it does give some more very interesting information (ph, etc) on many of the lube's we all talk about including replens and sylk. In fact someone has probably already discovered this- that's the way around here- but I found it on my own so I'll share it with ya'll just in case!
I purchased something and they were very helpful and my item came the next day (in NZ)... Check out some out some of the other products on their site about fertility issues and an at home sperm analysis, if you are begining to question that side of the fertility spectrum: http://www.baby4you.co.nz/Male+Fertility.html
Hope you all find this helpful.