as a precaution I took an i-pill within 12 hours ...

Hi,
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If pre-cum or semen has come in contact with vagina during sexual contact (genital contact or fingering) and if you were in fertile days at time of sexual contact, chances of pregnancy are possible. However, if you have taken the emergency contraception within 24-48 hours of unprotected intercourse, it should help in prevention of pregnancy. Withdrawal bleeding occurs within 5-7 days of taking the pill indicating that it has worked (it may not occur if the pills are taken closer to periods). Since these pills contain high dosages of hormones, these affect the hormonal and period pattern causing delay in next periods. Wait and watch for your periods which could be delayed due to the emergency contraceptive use. Visit your doctor/gynecologist for further evaluation if periods do not start within 10 days or if you suspect chances of pregnancy, or if you develop any other new symptoms.
If pregnancy gets ruled out, and if you are not ready for pregnancy, but intend to remain sexually active, you should consider visiting your gynecologist to get started on suitable regular birth control measures to be protected (after your periods). Be regular with birth control use as instructed. Avoid having unprotected sexual contact if you are not ready for pregnancy. Avoid repeat use of hormonal pills and emergency contraceptives. Be in regular monitoring and follow-up with your treating doctor/gynecologist and report any new/abnormal symptoms immediately. Drink plenty of water. Take adequate rest. Maintain healthy diet and lifestyle.
Take care.