Sorry for so many questions. . what does a contraction feel like? Since I woke up my stomach/pelvic…

Sorry for so many questions.

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what does a contraction feel like? Since I woke up my stomach/pelvic area is having an issue I think? On and off all day I've had this weird feeling. It's uncomfortable, almost like period cramps but not as bad [I have sever menstrual cramps from endometriosis] but they keep coming and going it's been almost 12 hours. It feels like my stomach should be hard when they happen but I've poked at it a few times and so far it has not been. Also baby is not moving much today. I'm only 21 weeks so I know that's not a reliable way to judge yet but it's adding to my concerns. I have felt her move a.few times but they were not as frequent or strong as usual [maybe she's just having a lazy day?]

I don't think these would be actual contractions this early on so I haven't timed any of them but I'm gonna starting now just to see.

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Any opinions? Is this normal?