I’m 10wks gained 10lbs

I am 5’7” and was 154 before pregnancy. Strong and fit. I gained about 11 pounds in the first 6 weeks and was 166. Once week 7 hit my appetite declined. That continues. Now I’m 165. Should I be concerned about such a huge initial weight gain? It’s not due to holidays I was not super hungry then. I’m still making sure I eat, I’m just not enthusiastic about it. I’m taking unisom sleep tabs for the nausea which helps. Very tired..also I started having very loose stool like at the beginning. Not sure what that’s about...