When did everyone start having Braxton Hicks?

I am 21 weeks and have been having an aching uncomfortable/painful point in my lower left abdomen. I’ve felt my stomach harden on previous occasions like described with Braxton Hicks, but this is just a constant ache/discomfort. When I stand I can feel it or if I try to lift my left leg (trying to flush a public toilet). I don’t think it seem like round ligament pain because I’ve experienced that too but in different spots. It doesn’t feel tight/hard on the outside like I’ve felt before, which I’m assuming were real Braxton Hicks. I just don’t want to be that person to call the doctor for no reason and seem like a crazy lady. I’m not in pain, just discomfort and want to make sure baby is okay. She’s still moving around when I nudge her!