My Period what is it?

I started a few Months ago and i missed my first month that was normal everyone i knoew did but it is the fith mont and this month i havent recived it and at the begining of the month i go a yellow substance (egg realse) but that was on the 1st i am supposed to strat on the around the 7th 8th 6th but i havent, but i have had huge issues and have been stressed whats the problem?