M i pregnent or some menstrual problem? pl help?

pl advice what to do?i exactly have 28days cycle(period date was 20th march).but this this time its 31 days,and m trying to concieve also.I took HPTon 20th ,21st and on 22nd also but it came -ve.(daily),i feel exctly as i used feel during my periods.its like pain in lower abdomimal.and feels as if sumthing is passinfg through uterus.feeling very wet..im checking after every one hr. whether my periods have started not .,how accurate is HPT? .some one told me go for blood test. is it accurate..when should i get it done. is it possible that m pregnent..i called a gyny she told me i should repeat the test after a week and if still it comes -ve she'll give a medecine to
to start the periods..how can she rely on hpt..she said i'll do blood test if u have unbareable pain.
and m affraid that if m pregnent, i should rest or not .

Delay/Difference in Menstruation:
A delayed or missed menstruation is the most common pregnancy symptom leading a woman to test for pregnancy. When you become pregnant, your next period should be missed. Many women can bleed while they are pregnant, but typically the bleeding will be shorter or lighter than a normal period. This symptom is commonly explained by other reasons. If you have been sexually active and have missed a period, it is recommended that you take a test.

Other Explanations: Excessive weight gain/loss, fatigue, hormonal problems, tension, stress, ceasing to take the birth control pill, or breast-feeding.

http://www.americanpregnancy.org/getting...

A blood test will show for sure if you are pregnant 7 days following conception and a pregnancy test can be taken up to 5 days before your period. It is though said if you get a negative but still yet not get your period in a week to re-test but if it is still negative you proably ain't pregnant.
Good luck and Take care!

Leave it a week and test again, and if still not see a different doctor and get a blood test. If that comes back neg then could be you wanting it so much that it delays your period.I have just been through the same, was nearly 4 weeks late, and i have had lots of symptoms, but it finally came yesterday.
im not 38 days without my period and pregancy symptoms, but i keep geting negative tests. im going to wait till monday and if nothing, im going to call the doctor to get a blood test and go from there. i recomend the same for you.
Your doc told you to repeat the test after 1 week, that's what you should do. Make sure you use the first urine of the day, and you don't hold the stick there too long. an invalid result will happen if there's too much pee in the stick (I learned this the hard way)

You aren't all that late yet. Wait another week and retest. I'm 3 weeks late and still guessing. It could take a little longer.