I'm 4 months pregnant and craving my husbands cum.

I've never experienced a food craving before. This is my fourth pregnancy and for the first time I have a craving. But it's not food. I'm craving my husbands cum. I can not get enough of the taste of him! Pre cum is the best. I milk him as much as i can so that I can get more of the taste of him. I've never been grossed out by my husbands cum and have always swallowed but now I can't get the taste of him out of my head! I think about having him in my mouth all day long and my mouth waters. I am literally craving his cum. The poor man is getting tired. He is getting on average 4 bjs a day and I'm always telling him I need him to feed me some more. He wakes up with my lips wrapped around his dick sometimes two or three times a night. It's so sweet and salty and flavorful. What is wrong with me?!? This is insane and so I unlike me. He is thrilled of course. He says he is cherishing this time and he will be sad when it ends. All I know is I can't get enough and I'm starting to think something is wrong with me!