I get this weird feeling...... Help me out ladies!!?

Ok this is going to be difficult to explain, but every once and a while, especially when I'm close to my period, it's like I dont want to be around girls, and I feel funny and uncomfortable with my mom. Its like a feeling that rushes through my body and makes me feel strange for like a few minutes, then passes. I sometimes will feel weird sittin around my mom without a bra on under a shirt or when I'm on my period I don't wanna be near her etc. Has anyone ever had this momentary female sensation before? Thanks!