If you make him dinner, tell him it's a surprise. You can start the dinner with a pre course of a postive test on a plate like if you are going to serve him dinner. And after all of that hoopla you can eat and celebrate.
As for your insurance issue, I can relate. If you cant get coverage, you can talk to any ob/gyn and see if you can pay monthly at every appointment until up to your seventh month. I had to shell out $3,200 dollars to my ob/gyn throughout this pregnancy until I paid it up. I paid $500 dollars at each prenatal appontment until the last one was $100 that I just finished this month. Mine was a little more than normal because my last baby was a C-section and I have to pay as if I'm gettng another one. even though we've discussed a VBAC because my fourth was a c-section (transverse) and all the one before were natural. he said I should have no problem popping out this one on my own. but I have to wait to make it to 35wks to discuss this with him. I'm 29wks today. And now I have to start paying for my "baby bundle package" at the hospital which can be any where from another $3,400- $7,800. its $3,400 if you say overnight with a regular Vaginal delivery and drugs are included. there is another one for a two night stay and the last is for a C-section that includes a 3 day stay with drugs.
Try giving him clues. Like a bib , a bottle or maybe a pacifier . You can get these at the dollar store . Congrats
I made to much for a medical card when I wasn't pregnant but once I became pregnant I was eligible I would try and see what your states rules are with maternity insurance.
For the fathers day you could frame a picture of the positive HPT and wrap it up or you could just put the picture inside a card.