Constipated after giving birth milk of magnesia ???

I was constipated like my whole pregnancy. So after giving birth I still was. They recommended milk of magnesia and an enema if I really needed it. I didn’t use either. I had started to go a little the days following giving birth so I thought it would go away on its own. I’m now 3 weeks pp and going maybe once every couple days and not a lot at all. I’m realizing I need to take the milk of magnesia. I’m a little nervous about taking it. What are your experiences with it ?