Girl, that's totally normal, a few of us tried primrose at 38 weeks din and karamihan namin nag-experience ng cramps or mild pain after, pero tulad mo nawawala after an hour or so kaya don't worry too much! Since you're that far along na, mas safe talaga to check in with your OB kung okay lang talaga mag-continue, especially if it's causing you discomfort, they can guide you better sa proper insertion or kung may ibang way na mas gentle for you. Rooting for you, mama!