Female friend issues

Hey girls  
I need some advice, a few years ago before my husband and I were dating he had a female best friend who was unusually close to him. He received calls and messages from her daily and at one point in their past they nearly dated but something happened. Anyway fast forward 3 years, I told him during the dating phase I was not impressed with how she was always in our business. During that time we were dating so I never really took any notice of it. Now I'm going to fast forward 3 years and a baby on the way. She suddenly started calling him every day and messaged him last night. When he didn't reply she was annoyed on whatsapp and even seemed angry. Now I am a very reasonable person but how dare she? I couldn't sleep probably. I feel so hurt and he's just thinking I am over reacting. She doesn't mean any harm. She has pet names for him. I am pissed off but pregnant I'm so mad I could scream. What do you guys think?