Constipation

Hello everybody so I have a quiestion, for the past 3 days I have been really constipated. I'm 16w4d, I tried milk of magnesia last night and didn't work what so ever. I know I have to eat because my nugget needs his/her nutrients but I feel so full. Could it be because my insides are making room for baby? Anywho my real quiestion is what can I eat to help I feel so uncomfortable I almost cried last night because I couldn't sleep. Thank you all in advance. Have a good day ☺️☀️