Excited!! but curious🤔🤔

So me and my boyfriend finally had sex! I know it's not something to get over the moon about but I am. We've each been with one other person and we're both of age. However now I'm experiencing slight cramping? With my ex I would expiernce cramping a long with a slight burning sensation afterward. I was just wondering if it's because it's been awhile? 🤔