Help! Early pregnancy & already slightly constipated?!

Hi ladies, this is my first pregnancy. I'm 4.5 weeks along and I've already noticed that my bowels are sluggish. Has anyone else been experiencing this? If so, what have you done to help the situation? I've started adding a fiver supplement into my decaf tea along with adding ground flax to my morning oatmeal however, it's not enough. Any advice would be greatly appreciated!