I had sex with my partner on 29th april and 2nd may. After that she took a pregnancy test on 6th may just for checking if she is pregnant or not. It came out to be negative. Thereafter we had sex on 7th may and her periods last occurred on 21st april and was due on 21st may consequently. But till now she didn't had her periods. What should we do now. Is the delay in periods could be the sign of pregnancy. We had protected sex and crosschecked the protection after sex. She is having headache and also its paining a bit while urinating. Are these the symptoms of pregnancy?