I don't want to bring down the party, but we've been using Preseed for the last 6 cycles or so and no BFP yet.
I have used softcups in the past when I had to get up and go after sex (used more to stop leakage). But it's not really supposed to be used for TTC. Any good sperm is already on the way, so you are just basically trapping the bad (slow) sperm.