Could I be getting a false negative

Twin Mom 👩‍👧‍👦💕💙 • Mommy of 2 👩‍👧‍👦 #twins💙💕

My boyfriend and I are ttc. Just recently (a month ago) I started taking prenatal vitamins to help with ttc, lately I have been nauseous(but not throwing up) having what I guess you would call hot flashes, peeing a lot sleepy all the time, and hungry I thought I was pregnant but every test that I take is negative could it be possible that I am getting false negatives or is it just the vitamins. Help please