For the past 4 cycles my period as been acting weird , my period used to be quite regular I would get it between 28, 29,30 the longest my period will be late is 2 days .. but now for the past 4 months my period came early day 24,25,26,27 and now I’m on day 37 and still nothing. I don’t understand what’s happening it’s all happening so sudden should I go to the doctors ??? I’m 16