Hi     I am worrying about the p

Patient: Hi.I am worrying about the pregnancy. I did sex with my boyfriend on 19th sep 2014, 25th jan 15, and 3rd feb. During sex we used condoms. After September i got periods in regular and in correct time.But this month feb my period due date is 10th but till i didn’t get the period. Is there any possibility for pregnancy.I read some queries about late periods but i am worrying there after also.. I am age of 21.Please help me…what i do now..What are the symptoms for the pregnancy other than periods… Plz help me..