Welcome to healthcare magic forum. If your previous cycle was regular,then need not to be much worried. Also your pregnancy
tests are negative.
But one thing,if you get persistent irregular period ,then you may suffer from OLIGOMENORRHOEA and need to investigate properly.
It is defined as infrequent period and delay of several months in between and more common in pubertal girls.It is mostly due to inadequate maturation of H-P-O axis and inadequate hormonal
The cycle are often anovulatory in first 1-2 yrs.Gradually full development of normal ovulatory cycle and it will not have any harmful effect in future fertility
1)Mental & physical stress like vigorous exercise
nervosa-if wt less than 47kg,mens remain scanty.
4)PCOD with over wt.
So you need to do a USG,Thyroid function test,FSH/LH and prolactin
level if period is irregular or delaying more than 2 months and consult to your gynaecologist.
Along with maintain a healthy diet,control wt and regular light exercise.
All the best. If you need extra consultation,then contact with me,my id: email@example.com