Breast pump trial -hurts bad 38 weeks

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Hi, I am 38 weeks pregnant FTM. I tried breast milk pumping today with an electric pump. There was minute leaking/oozing of colostrum.

But after I stopped my nipples and area around it hurt a lot, also I felt nauseas and dizzy. Is this normal in the beginning?!

If not am I doing something wrong? Please help

I am in extreme favour of breast feeding my baby, but the pain is scaring me now