Cervical orgasm?

Ok so i just started having sex recently. My man thrusts very deep when we do it and I feel this strong wave of warmth ebb from the inside of my vagina to my core. It feels very good (like butterflies in my stomach) but it only lasts for the duration of the in-going thrust. And I moan involuntarily when that happens.

Is this a cervical orgasm?? Because it feels amazing but not quite like the clitoral orgasm I know when masturbating (where there's a build-up and lasts longer ish)