Hello,
There are chances of pregnancy with the precum also,specially around the time of ovulation, although rare but they are there.
If your period is late or you have missed one i would advise you to go for a home pregnancy test.
Take care, don't worry every thing would be fine, but i would advice you to use proper protection to avoid unnecessary abortions.

Hello,

First of all, you should undergo one home pregnancy test with urine at the earliest and one blood test for beta-HCG to confirm/ exclude pregnancy. Sometimes precum or prostatic fluid, secreted prior to ejaculation, causes pregnancy in low percentage and it depends on fertile period.

Following test report, you should consult with your gynecologist for next line of management after physical examination.

In exclusion of pregnancy, other reasons for late period are hormonal imbalance, ovarian cyst, high prolactin level, stress/ anxiety, thyroid problem, wt gain/extreme loss, irregular eating habits, psychological factor etc.

You may require some investigations to rule out underlying pathology through USG pelvis scan, thyroid profile & other hormone assay, blood sugar & prolactin level etc.

Avoid stress / anxiety, take healthy diet with vitamin & iron supplements, eat more fruits & vegetables, drink plenty water or juice and maintain genital hygiene properly.

If you need further consultation with me, then you can visit http://www.healthcaremagic.com/doctors/dr-soumen-patra/63326.

Take care yourself.