My periods are very much regular.most of the tym 2-3 days before due date my periods start.first day of my last period was on 6th feb and on 8th mar I noticed slight blood spot,I didn't had regular bleeding.so is there a chance tat I'm pregnant?should I go for pregnancy test?

If you feel that this is not a regular period, then yes, pregnancy is possible. Bleeding during pregnancy can happen.

Wait until at least 2 weeks after your period was due, then test using first morning urine.

It could just be that you're having an off month, so don't get your hopes up too high. Many things, not only pregnancy, can alter our periods.

Good luck.