Hello, well from the history you have given, pregnancy
cannot occur without ejaculation of semen. ....Correction of irregular periods
is important....Delayed periods can occur due to many causes like stress, commonest cause especially in your age group is polycystic ovarian syndrome
, sometimes underlying medical disorders like thyroid also cause delayed periods....Mild pain prior to periods is common, this is due to action of prostaglandins
. ..But in case pain is very severe,then you may have to consult your gynaecologist for further evaluation. ..hope i was helpful to you. ....