Menstrual cups sizing question!

Rachel • older than I look 🙃🙂🙃🙂
I am interested in getting a menstrual cup, but I am questioning sizing. Currently, o.b. Tampons are the only tampon I can wear comfortably. Applicator tampons no longer fit comfortably, I am guessing due to their length. Any other ladies out there who made the change for to similar reasons? What is everyone's favorite brand for comfort and price? 
Thanks 🤗

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