Caught my husband masturbating

So we are in bed its 2 in the morning and I am a very very light sleeper so I wake up to my husband turned the other way straight and I can feel the motion. Idk what to think about it, it’s never happened before and maybe im over thinking but we are waiting 48 hours so he can check his sperm count and he knows we have to wait the 48 hours couldn’t he have waited, that matter and the matter that’s never happened or that I hadn’t caught him before have me overthinking.And why is he masturbating, we are very active with sex. Know idk if his going to tell me or just do the test knowing it’s not 48 hours, I have to wait and see what happens.