Thanks for query,
A women gets ovulation gets period.If you have no periods then you are not ovulating.
For being pregnant ovum is must.
You should consult a Gynecologist as early as possible.
As you have history of periods before there might be possibility of ovarian lesion.
Doctor will examine you ask for Ultra sound
& advise medicines accordingly.
Don't worry as you have past record of normal cycle it will settle & you get pregnant.