While most say that whatever sperm will make it into your uterus do so within minutes if not seconds of the man ejaculating.. I still used Instead Cups when TTC. Not sure if it helped, as we had cycles I used it and no conception and then cycles I used it and conception occurred.
I think it's more important to be drinking plenty of water (I did water, cranberry juice and grapefruit juice) to have good EWCM. And then for my peace of mind, I lay down after DTD for a good half hour and make sure to have an ...
afterwards as well as it's said the uterus dips down due to the contraction.
But yep, I used Instead. And when 12 hours had passed, I just squatted over the toilet to take it out, tossed it in the garbage and quickly washed my hands. Ick, lol.