Should I tell my husband now, or later?

I'm probably over thinking this, but that's what I do, so I need your input.

I took a pregnancy test shortly after my husband left for work and it's negative. He just got to work about 20 minutes ago and will get off in about 8 hrs.

We have been trying to conceive for 4.5 years, going through fertility treatments, and he knows today is test day.

Part of me wants to tell him now because I'm sure he will be wondering all day and then he will get home thinking there is still hope. Then part of me wants to wait so I don't ruin his day at work. I'm not even certain when he would see the text if I text him right now. It's only his second day of this new job, so I'm not sure if he keeps his phone on him, or can only check it during certain times.

Please help a sad over thinker 😔