Tried to surprise my boyfriend...

Cynthia • I`ve had cervical cancer since I was 16yrs old and was told I`d NEVER conceive but I miscarried at age 18 and since I`m engaged we`ve been trying ever since we got engaged and nothing
So I got naked to surprise him since I'm at my most fertile right now and he didn't react at all just sat down what did I do wrong he wants us to get pregnant too so it surprised me n how he reacted.....any advice?