Divacup ttc? +robitussin

I've read about women inserting softcups after BDing to conceive! I was wondering if anyone has tried using a divacup instead? I just got one for my periods but am thinking about giving it a shot when ttc! What are your experiences, do you have any advice, and who was successful?!

I've also heard of women using robitussin to thin their cervical mucous and am wondering how long you have to take it in order for it to work?