Vagina stuck in underwear!

I just got brand new lace Victoria secret underwear and I went to the bathroom at school and as I was walking to go meet my boyfriend to go home my vag was hurting. When we got home I went to the bathroom to see why my vag was hurting and my lace underwear literally wrapped one of my lips and was cutting the circulation off! I had to rip the underwear! I was so scared! Has this happened to anyone else before?