Hi Im 6months Pregnant N Im Feeling Pain In Lower

hi im 6months pregnant n im feeling pain in lower abdomen n alsofeeling baby movement in very lower portion of abdomen. just feeling movement at the end part. someone asked me to take gravibinon inj. should i take it or it has any side effects ?during 5th month of pregnancy doctor told me that baby head is in lower part than normal n i should take rest. im aworking lady working as lecturer in university i hav to sit n stand for longer hours including travelling. what should i do.