Congrats to you on getting the bfp!! I do the same thing you do, but it hasn't worked for me yet, so here's to instead soft cups!!
I'd say go for it. The thing I did was just slip my undies back on and for the first time this month put a pillow under my hips. Must have done the trick.
They are originally intended to be used during your af to trap the menstrual flow next to the cervix. A lot of people are using them right after bd- and are leaving them in over night to keep the semen close to the cervix. I will try just about anything now!!! Google instead soft cups to see peoples success stories.