I need advice

Me and my SO have only been together for about a month but we’ve had a thing for a long time and he’s always been my best friend. Well my period is nine days late 🙃 I really don’t think I’m ready for another baby but I know termination of the pregnancy is not something he’s going to approve of very much just because he wants a child of his own... I don’t want to break his heart by telling him I’m not ready physically and emotionally if I am pregnant. I really don’t think I could handle it but I don’t think he’s gonna understand it that way. What do I do? Please no hate towards my SO for his stance on the termination.