It’s important that you realize that there are a myriad of hormones running through your body when you’re pregnant and these will affect your mood.  For example, you may notice that during your first trimester you’re more tired, irritable, and have less sexual desire.  During your second trimester you may feel more energized and have an increase in your sexual appetite.  As you approach your third trimester the exhaustion, irritability, and lack of sexual desire may return.  Be sure to share with your husband/ partner about the normalcy of the range of emotions you are experiencing, so they can understand, not take it personally and support you the best they can.