menstrual cycle question

sorry if something like this has been asked before...

i have been on my weight loss journey for 9 months now and have lost 84 pounds. i had an instance about 2 months in where my cycle was about 10 days late.... at that point i had lost about 25 pounds and i think that the weight loss was the culprit that time. it regulated from that point on and i was regular every 28 days. until today! today is day 21 for me, so i should have 7 more days until i get my period, but i just got it and i'm a little confused. i don't think i've done anything different lately that would throw my cycle off. my weight loss has slowed down and evened out at a steady 2 pounds lost per week.

last week i had a 24 hour stomach bug and vomited a few times. i have also switched my vitamin from just a b12 supplement (i'm vegan) to a vegan specific multivitamin to make sure i'm ok with iron and my b vitamins... could either of these things have thrown my cycle off?

i'm not really worried about this, just confused. i have re-signed up for www.mymonthlycycles.com to keep track of my cycles, but it takes a few periods to see a pattern of course. i used to use that site to know my "extra fertile" days so my husband and i could be careful, but now we're just sorta letting things happen if they happen in the pregnancy area (not trying not to and not trying to, haha).

oh, and i'm 25 if that matters at all.

I like when we assume we control our bodies.  In reality, our bodies control us.

I've found that my cycle can be right on the money or it can piss me off and show up a few days early (usually when I have the opportunity to buy tampons and tell myself I can wait another day or two).

I'm sure it's nothing to be worried about.  Typically girls get it within 21 to 28 days of their last cycle, not an exact 28 days. 

i'm always right on 28 days!! i can count how many times i haven't been on... 2 fingers, haha.

you body fat regulates your hormones. so it will change it up with wt loss. also the time of year can affect it.

Congratulations on your stellar weightloss!!

If you consistently begin to have irregular periods i would consider that something is interfering with your cycle - diet or otherwise. But one month where it is off really means nothing. Could be something or might not be. Probably nothing if it goes back to normal next month. Do you get yearly checkups at the OB/Gyn? If not I highly recommend it.

no health insurance so my "yearly" checkups are more like every other year... my last visit was in july 06, i know, bad sarah. i honestly can't afford it right now though... hoping i can by the end of 07, though. everything was fine last check-up though.

I have also lost just over 80 pounds since last June.  My cycles went from being every 27 days to being every 23 days for 6 days.  this also happened to me when I lost some weight as a teenager.  I mentioned it to my gyn when I was there recently and he confirmed that weight loss and exercise (especially changes in patterns) can change your cycle.  I was hoping it would make mine longer not shorter but  I'd much rather have the weight gone than the longer cycle.  :)

If you start to bleed between  your periods or the bleeding is excessive, I would worry about it.  Fluctuating a few days in cycles is probably nothing more than a major annoyance (especially if you always were a set number of days prior to this).

Pam