not sure, but any advice is appreciated

My husband bought this freshwater fish today from a local store, and he plans to cook it tomorrow. I'm scared to eat it because I'm currently 4 days late. Should I wait and see if I start by tomorrow and if I don't then tell him? Usually he knows when I'm late, but this month he hasn't said anything. I don't have any tests currently or I would take one. I had planned to not tell him I was late until I was 1 week over, but now Im unsure. Any advice would be greatly appreciated :)