Venting

I have been divorced for a year and a half now. I live with my boyfriend. We have been together a year. My ex had always said he was to know every time my boyfriend was around my son. Now he is dating a girl he met online. He had only known her 4 months. Well i found out she's staying the night at his house and around my son without my knowledge. I haven't met her yet. I'm and going crazy over it. I'm just being told I'm too over protective and it's my hormones. I'm 28 weeks pregnant. I just want the same respect! Am i wrong for being so upset?