My period cycle is regular and about 30 days. I had sex on 4 th January  and I took i-pill next day.  My periods come on 18 th January which is 4 days earlier to my cycle. I again had sex on 10th February but this time it was precum and not ejaculation. I didn't took i pill as it was my safe period and he didn't ejaculate. But I am having no signs of periods on 18th February.. No sore breasts,  no breast paining nothing at all which is usually occurs to me before 5-6 days of my period starts. Am I pregnant because of precum or late period is Ipill side effect? 

Please help me to know.