I am 22, weight 61kgs, had my last period on 23rd Feb (which was 6 days early), and unprotected intercourse on 13th March... I still haven't got my period. I tested on HPT thrice in the last 3 days, and it has been negative all times. Do you think that I am pregnant?

When would March period be due, if Feb was early, then March , if on time would just be due ? You can not test till you are 14 days late on your period. So please just wait and also always use only the first urine of the morning as soon as you wake up.

But any time you have sex, there is a chance of pregnancy