CD21 - feeling pressure

Caitlin
So I'm on CD21 and have yet to get a positive opk, but today I have a feeling of heavy pressure in my lower abdomen, I've had it before thinking I was actually preggo but obviously wasn't. Has anyone experience this? It's almost like the pressure of having to pee but it's not. I've had UTIs before and don't think it's that. Any ideas?

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