Anmum Effect

Hi co Mommies, question lang po, I'm 17weeks Prego, my OB advised me to drink any kind of milk, but I decided to drink anmun for a week now. kaso everytime umiinom ako, zumsakit tyan ko and it triggers na magdumi ako. What I'm worried po is it also causes the paninigas ng tyan. Normal lng po ba sya? What I'm thinking is baka nagaaddapt lng and eventually mawawala. Baka po may mommies here who had the same experience as mine ?