Is this likely?

I got my first period December 6th. I used a period tracking app and I think it's accurate. I know you usually aren't regular for a few years but just listen. I drink the correct amount of water a day which is 64oz and I drink exactly that much sometimes more. I have a really balanced diet. I eat fruits and vegetables and take vitamins and I eat a lot of meat and dairy and wheat all in one day. My doctor said I am probably the healthiest kid he's ever seen. So I don't think I'm lacking vitamins. Anyways. The app said I was supposed to ovulate on December 20th. I had this really white and thick discharge on the nineteenth and some on the 20th and I havent had any discharge like that since. Here lately I feel as if I am pmsing but not like cramps and crying. Just little stuff. Do you think it's likely that my period will come on the second or third of January? Is it likely to be regular that soon? I just don't want to not get it then go back to school after break and bleed through my pants or something embaressing. If I'm almost absolutely positive I was ovulating that day.. Because Im sure I did.. Does that mean my period could come about on track too?

?2015-01-01T21:43:58Z

Period tracking apps PREDICT your cycles based on previous cycles.
If this is your first cycle then it has absolutely no way of predicting when your period is likely to be due - not with an app, and no way we can tell you when your next period may be due either. The app is likely guessing when your next period will be due based on the average 28 day cycle but...

A. Your menstrual cycles may not be 28 days.
B. Even with regular cycles anything up to a weeks variation is normal.
C. Stress and ill-health can delay ovulation, thus delay menstruation.
D. Menstrual cycles are often very irregular at first.

Unless you use Fertility Awareness Method (FAM) you can't know for sure when you ovulate or when you menstruate - although women who've great body-literacy may be able to guess when they may be ovulating based on fertility signs: *fertile cervical mucus, high open cervical position, ovulation pains, ovulation bleeding, breast tenderness, groin gland swelling, swelling of labia, etc.

* Thick white discharge isn't a sign of ovulation. Around a week leading up to ovulation you may see fertile quality cervical mucus which is stretchy clear discharge, like egg-whites - this may make you feel wetter down below, you may notice toilet paper slides over your vulva easier, or if between your fingers it'll stretch.

It's unlikely your next period will be so heavy as to leak through your clothing, periods normally start light so normally you can feel it starting or will notice spotting when you use the bathroom, thus can put on a pad - you can also use menstrual cups, softcups, liners, or pads before your period to avoid leaking if it starts unexpectedly. Just be sure to keep plenty of supplies with you, and ask friends to keep an eye out for leaks.

Please don't use PMS as a verb, PMS is a nonsense term to begin with as it's a social term for any sort of negative symptom associated with menstruation, under the false assumption that these negative symptoms are normal. PMS can include any one of over 150 symptoms, it's that vague.