Pregnacare Original Side Effects

So I started taking pregnacare on monday, so took my 5th tablet today and ive pretty much had a constant upset stomach. Not to the point where its severe diarrhea, but enough to cause upset and not had passed anything solid for like 5 days. Anyone else had this and how long did it last for you? I am tempted to switch to just folic acid but know my body is gonna need time to adjust to all the new vitamins and its best for baby. I am only 5 and a half weeks so still very early on.