Will swallowing cum mess up my interimnting fast?

I know this is a weird question so I apologize.

I swallow my husbands semen and I am doing IF 16/8. If I swallow during my fasting window, Is the fast broken? I have read that you can’t have ANY calories during the fast, but I’ve also read that it’s technically not broken unless you have under 50. I know cum is under 50 but it’s not calorie free.