Prenatal vitamin- diarrhea??

we are TTC so I hv started taking my pre natals as my doctor advised and said there is no harm in starting it early. I was fine the first month but now I feel like my prenatal vitamin is causing me to poop more often (3-4 times a day) which isn't normal for
me and it's like diarrhea. Has anyone ever faced this issue??? i am taking the 1a day pn w dha- all in one pill