Weight gain

I found out I was pregnant 8/3/2018 and my 1st prenatal appointment was at the end of August. Doctor told me to gain 1-2 pounds a month. My weight was at 183 and i gained 1 pound and lost it again. So I’m back at 183 and I’m not gaining it. Also I try to eat more but i feel like I’m forcing my self to much. What do I do?