Hi I am neha 25 year old. My last period was came on 17th April 2018 and after that I was done unprotected sex. My monthly routine circle is 28 days according to that it should be come on 15th or 16th May but today it's 25th May and my period did not come till now. While it was never late. I have also check 4 times via prega news but every time result coming negative. �if I am pregnant so why result coming negative and if I am not pregnant than why period is not coming. 1- While it's 6 days above and still it's showing negative that means I am not pregnant right or wrong? 2- What's reason can be behind of it I mean why my period is not coming? 3- could it possible if there is swelling in my under part? Kindly let me know these. I'll very grateful. Also I am very confused to take all these because here is no symptoms looking like that as I am pregnant, however I am confused that why period is not coming.