Thanks for the query.
Since you have used contraceptive
method while intercourse, with pregnancy
test being negative, less likely you are pregnant.
Other causes of missed periods is hormonal imbalance, Stress, emotional disturbances, thyroid problem and ovarian cyst
I recommend you to consult a Gynecologist to narrow down the causes by specific investigations.
I also suggest you to use contraception
and practice safe and protected sex.
Hope this helps.