Creaming?

My boyfriend noticed that during sex I have recently started to “cream” that’s how he described it ? The first time he noticed, he said he saw “white stuff” coming out which hasn’t happened before, atleast we haven’t noticed before. And today I saw it too. I’m not uncomfortable in anyway during sex, but what is it actually? We’ve only noticed it twice. Is that something normal or do I have something to worry about? It’s like just white liquid, it’s not super thick, but it’s not runny. Please let me know lol