Hello,
Unprotected sex with pull out method has high failure rate around 15-28%. Though it depends on ovulation time or fertile days.
Therefore, I suggest you to undergo one home
pregnancy test with urine at the earliest and may need to do
blood test for beta HCG for confirmation.
In exclusion of pregnancy, reasons for late period are
hormonal imbalance,
ovarian cyst, stress/ anxiety, wt gain/extreme loss, irregular eating habits, psychological factor etc.
In such cases, you may require some investigations to rule out underlying pathology through USG pelvis scan, thyroid profile & other hormone assay etc. Consult with your gynecologist and take suggestive measures.
Avoid stress / anxiety by regular deep breathing, take healthy diet with vitamin &
iron supplements, eat more fruits & vegetables , drink plenty water or juice and maintain genital hygiene properly. Always practice safe sex to avoid unwanted pregnancy.
If you need further consultation with me, then you can visit http://www.healthcaremagic.com/doctors/dr-soumen-patra/63326.
Take care yourself.