I'm 21 years old unmarried girl. I had an unprotected sex with my boyfriend on 23-24 of April, 2016 and I didn't take any contraceptive pills. Now i'm so worried about being getting pregnant cause my periods are always regular but this month my periods comes 5 days late than expected date on 9 May, 2016 with less bleeding than usual i'm very much confused that it is implantation bleeding or periods bleeding. I feel very uncomfortable these days having back pain, heart pain, headache, constipation and breast tenderness-soreness-tingles. I'm so tensed about all this. On 21 May, 2016 i'll take an home pregnancy test with Preganews but it comes negative. On 29 May, 2016 i again took an home pregnancy test with Preganews again its come negative. Now i'm very much confuse by all this coz test are negative but my body symptoms make me tensed. Plzz help me please I didn't take any risk of pregnancy coz i'm unmarried. Already I have done a big mistake by have an unprotected sex. Now didn't want to do any mistake.