Orgasm help

My boyfriend and I have been together for a while, lost our virginities to each other, doing stuff for a couple months. But I’m yet to cum. When he goes down on me and fingers me it feels amazing and my legs start to shake, but then they stop? But it doesn’t feel like I’ve orgasimed?? Have I? I feel so good and I shake but idk if thats it. It’s not for his lack of trying, he cares and tries his best to make me finish. Any advice? 💜