Random pain during intercourse

Cayla • Mom of 4 aka full time hot mess
Ok so I've looked all online of what may be the cause but can't find anything. Tonight while my husband and I were intimate he could only go half way in because it hurt otherwise. It was a deep like penetrating my insides hurt. I've absolutely never had this happen with him before it wasn't a new position or any other outside force that woulda warrant this sudden discomfort. Normally (tmi) I really enjoy it when he's completely in and have absolutely no issues with it at all so I'm kinda weirded out by this sudden change. Any others have this experience was it a one time deal or a bigger issue?