If my cycle period it 25 the i got my mps on 23oct n fns on 27oct did unprotected sex on 28 oct the again unprotected sex on 4 nov can i b pregnant?

It's possible: Yes, it's possible. You need to be thinking about birth control if you don't want pregnancy.

Can be: Conception, as defined by the generation of a fertilized ovum, occurs within day or so of the sex. However, it takes about two weeks for the embryo to make enough HCG to produce a positive pregnancy test. Blood test may be done a day after a missed period. Home pregnancy tests should be done 4-5 days after the missed period. Use first morning urine and follow instructions for the test carefully.