My ip has changed all of a sudden? how?

so. i play minecraft and i made my own server that i could play on. and i need my Pv4 ip in order to play. i need to type it in. anyways i had it saved so it would auto be typed in. yesterday as i was playing my ip was ***.***.*.6 i got on today and tried to connect to the server i had made and it wouldnt let me connect. so i decided to check once more and make sure i didnt screw up my ip somehow without trying. and i look at my ip not and its now ***.***.*.8? should i be worried?