I'm 24 married had sex on the 1s day of my menstruation n the next day I noticed there was no flow though I had a protected sex, what could b the reason? M I pregnant?

Your not pregnant cause your body is shedding the uterine lining there is a site that you should go to its called http://www.epigee.org/menstruation/sex.html it has all type of answers for questions in regards to a period hope this was helpful

But then why there was no flow the other day? It wuld hv continued d same way if I had'nt taken smthn warm to eat (nariyal aur gud) thr was a flow 4 smtme bt again d next day thr was no flow den out of fear of getng pregnant I took an ipill. Did I do nythn wrng? Please help me out.

It is possible while not likely to get pregnant during your period. I am sorry for some incorrect info you may have been given. This of course is most likely not what it is, but it is a possible.