Hi Welcome to healthcaremagic.com
if your cycles are regular, you suppose to go get your period on 4th of March. But you are having unprotected intercourse
, so you have the possibility of becoming pregnant.
But right now your pregnancy
test is negative meaning you are not pregnant. I will recommend test again and if negative, you are not pregnant. Delay of cycles by 10 days is normal. But if you still not getting periods, consider Ultrasound
of the abdomen and serum beta HCG
levels in consultation with Gynaecologist.
Regards Dr. Jagdish