However, I've just realized that my flow is probably heavy. I thought of it as more average/moderate but after researching tampon capacities, I'm not sure. I don't want to change the cup more often than I change tampons now.
Currently, for the first 2 days (heaviest days), I go through an ultra tampon in 2-3 hours (Tampax Pearl Ultra, if it matters). After that 2-3 hours, the tampon and string are completely saturated and dripping with blood. It's so full that I barely need to pull the string to remove it. If I didn't also use pads for backup, I'd have to change every 60-90 minutes. I plan to use cloth pads with the cup as backup, but I just don't want the cup to overflow in 2-3 hours.
Do you think the small Si-Bell or Lunette have enough capacity for that? Are there any cups you'd recommend instead?
Would it make sense to get a large Si-Bell instead even though I'm nulliparous? It has a greater capacity than the small, but is still soft and has a long stem.
Thanks in advance for your help/advice. I really appreciate this community and am grateful for all I've learned so far.