Is it normal to have pregnancy symptoms on and off?

I’m not even sure I am but I’m 38 days into my cycle and going to the doc on Wednesday but IF I am , is it normal to feel the symptoms on and off? For example, one day my breasts would hurt and be huge and sore next day they aren’t then next day the soreness comes back. Same thing with cramping and back pain.

It would be my 3rd pregnancy, I read that if you are pregnant, symptoms are on and off til 12 weeks, is that true?

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