Why have I missed my period?

Hi, I didn't know where else to post so hopefully someone reads this, I'm 18 and I started my periods when I was around 13 or so, I started having very irregular cycles but as the years have gone by my cycles have kind of regulated where I have about a 40 day cycle, yes I know they're really long, that kind of worries me but I read 40 day cycles are normal for some women. What I'm worried about right now is that I'm on day 49 of my cycle and my period still hasn't come, I've never had penetrative sex only dry humping w clothes on, at the time when I was supposed to start my cycle I wasn't even experiencing any of the normal symptoms I usually feel when I'm about to get my period but now I feel nausea and my nipples hurt and sometimes I have lower back pain, I've always been super paranoid about getting pregnant and I'm really scared like what if there was a chance it's possible? Also, around a week and a half I was supposed to start my period I started taking a root powder called maca which is supposed to help regulate hormones and increase fertility, I took it thinking it would help me regulate my cycles but now my cycle got worst and what if by increasing my fertility there was a slight chance I could've gotten pregnant through dry humping?! I've been super stressed lately because of this and I don't feel like eating I just want my period to come and can't think about anything else.
P.s I stopped consuming the maca on the day that I was supposed to get my period because I didn't think it helped.
Also, what should I do if my period doesn't come at all like this month ?! Should I take a pregnancy test or just wait till next month or what ? Thankyou so much for your help I really need it.

Hello Anonymous,

Welcome to EmpowHER. I am glad you came to us with your concern about not having a period in 32 days.

Irregular periods are common in girls who are just beginning to menstruate. It may take the body a while to sort out all the changes going on, so a girl may have a 28-day cycle for 2 months, then miss a month, for example. Usually, after a year or two, the menstrual cycle will become more regular. Some women continue to have irregular periods into adulthood, though.

When a girl first gets her period, doctors call it menarche . Menarche doesn't happen until all the parts of a girl's reproductive system have matured and are working together.

When a girl starts puberty, the pituitary gland releases hormones that stimulate the ovaries to produce other hormones called estrogen and progesterone. These hormones have many effects on a girl's body, including physical maturation, growth, and emotions.

The amount of time between a girl's periods is called her menstrual cycle (the cycle is counted from the start of one period to the start of the next). Some girls will find that their menstrual cycle lasts 28 days, whereas others might have a 24-day cycle, a 30-day cycle, or even longer. Following menarche, menstrual cycles last 21–45 days. After a couple of years, cycles shorten to an adult length of 21–34 days.

A girl's menstrual cycle is counted from the first day of bleeding in one month to the first day of bleeding in the next month.

Anonymous, you have nothing to worry about:)
Maryann