mild cramps and paninigas ng tiyan

15 weeks preggy na po, been advice ng OB na magrest for almost 1 month na due to threatened abortion, noong 1st trimester ko madalas ako makaranas ng cramps and lower back pain, pero after 1st tri bihira na lang cramps, pero lately sa gabi naninigas tiyan ko minsan almost 1 hour na parang mapapadumi pero gas lang naman lumalabas.. ask lang po experience niyo duri ng your 4 months. salamat