low progestrone

Hi I'm 35 yrs old, and I'm diagnosed with low progesterone levels at my 5 weeks pregnancy. Doc's preferred is 100 and I only got 45, hence I'm prescribed with utrogestan. I'm at 7 weeks coming to 8 weeks now feeling super tired and no appetite everyday. I've also gotten this feeling like I wanna poo kinda intestinal discomfort because I constipate. Am I ok? Anyone has got similar situations to share?