Losing me big O???

Guys so me and my husband have been together for about 4 years my sex life is amazeballs I always reach my O with no problems! But the last couple times we had sex it got to the point were I was about to orgasim but then the sensation went away and I don't know if I even cummed 🤔 why is this happing to me will I never be able to have an O again ???? I'm so worried this has never happend also I've noticed my clit being. Little more sensitive than usual any input would help thanks !!!!