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&aposs 21st 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 now question is this that if I am pregnant so why result coming negative and if I am not pregnant than why period not coming. It can be also towards swelling because I am feeling like that but I want to know that after how many days it can be confirmed via test kit that I am pregnant or not. Kindly let me know about all these all things so I can take any action about this. Kindly reply as soon as possible.