・・・どうしよう・・・妊娠なんかしないわよね・・とにかく早く帰って体洗わないと・・
What should I do... I'm not pregnant or something, right? (わよね adds emphasis on that last part)... anyhow, I've got to get home quickly and wash myself (my body).
"Pregnancy" is a verb here (妊娠しない).
With ないと the implied result isn't described here...