Periods are contagious

So I live with my mom and sister. Well I usually start my period after both of them and my mom starts earlier and my sister is after her .. so this month was my mom first then my sister and I started TODAY which I usually start next week and the time my sister has hers because she’s on it right now. Like wtf?!!? How magic can this be our cycles want to be together for some reason??? Hell nooooooooooo!!! I hate periods!! Anyone has this happen to them let me know and if it’s Normal ? Feel like it’s contagious because we usually start our periods separately 😰😩😭😩 I can’t be around women