I've been feeling paranoid about pregnancy lately?

Okay out of the blue my mom says "U better not get pregnant" which makes me start getting paranoid about it. Ever since I've been feeling weird and have a stomach ache from it. Also my nipples are slightly sensative. Note i didnt feel ANY of this before my mom said it or me looking up the early signs. I hadnt had sex for over two weeks so I took a p test and it was negative. Whats up with me?