Hi Catmommy,
I have not tried robitussen as I was trying to be very 'pure' and not have any artificial things in my body, however I believe some women have used it with success.

While ttc this time I used Preseed and OPK's. I did the bd every day when I had a positive opk and I used the preseed at these times also.

Prior to ttc I consulted a herbalist and was taking a special preconception mixture to aid conception and help hold pregnancies. I took vitamin C, a prenatal vitamin, zinc and vitamin E.

I hope this has helped.
Love Deb