I’d been using the Diva cup for a little over a year when I found out I was pregnant with Gabriel, and the menstrual cup was relegated to the bathroom closet for over two years (9 months of pregnancy + 17 [wonderful] months of lactational amenorrhea).
Once I started cycling again, I wanted to continue using a menstrual cup, but I was uncertain about using it with an IUD, since some people talk about the suction from the cup pulling the IUD out of place. Some cup manufacturers said, “no big deal,” but some said “check with your doctor.”
To be honest, I doubt many GYNs are terribly familiar with menstrual cups, so my doctor saying that it “should be okay” wasn’t all that reassuring, when the IUD being in place and doing its job was all that stood between me and another pregnancy.
But I didn’t want to go back to tampons, when I knew there was a more sustainable, and, in most ways, more comfortable alternative, and I had a perfectly good menstrual cup sitting in my bathroom closet. (Note: the Diva cup manufacturers recommend replacing the cup every year, but manufacturers of other silicone cups, like the Moon Cup, claim you can use a cup for up to 10 years. I had already decided that I was going to get more than a year out of my cup.)
The Diva Cup comes in two sizes, and, at the time I bought mine, the smaller size was for women who had never given [vaginal] birth. In the months after G’s cesarean birth, this seemed one small positive — I could still use my smaller size menstrual cup — yay!
But for some reason, my trusty Diva cup wasn’t working. I remembered there had been a bit of a learning curve when I first started using it, so I double checked that I was doing everything correctly.
In the process of hunting around the Diva cup website, I came across their updated sizing recommendation, that ALL women over age 30, regardless of having ever given birth (and all women, regardless of age, who have given birth vaginally OR by Cesarean), should use the larger size cup (Model 2).
Humph, so much for getting more use out of my original cup!
I shelled out the thirty-five dollars for a new, “Model 2” Diva Cup, only to be met by more failure. I couldn’t get either size Diva Cup to fit correctly and comfortably and not leak, and I was almost ready to throw in the cup!
Then I came across Glad Rags, and their 90-day, money-back guarantee on the Moon Cup, another silicone menstrual cup. After consulting with a customer service rep, I chose the larger size Moon Cup (size A), placed my order, and hoped for the best!
After several months of use, I’m pretty happy with my Moon Cup. It is very similar to the Diva Cup, but, for whatever reason, it works for me, while the Diva Cups don’t (even though the smaller Diva had worked for me, for over a year). Both are medical grade silicone, but the Moon Cup seems to be slightly more flexible (and perhaps thinner?) than the Diva.

My only complaint: The Moon Cup does not work when I am lying down. This means that I still have to use a tampon sometimes, usually overnight on my heaviest nights, which averages out to about three nights a month — not perfect, but not bad!
I’ve also realized that, thanks to the comfort level with my body that developed while using a menstrual cup, I can use tampons without applicators, which really cuts down on the waste when I do need to go that route.