Husband jokes "Its all in my head"

Trying not to think to into things, begining of December I took not one but two pregnancy tests and they both show dark and clean Positive!! I told my spouse the good news and he was great, very supportive and seemed excited. The last few weeks he has made a constant remark that "Im not pregnant its all in my head" or "Im going to laugh if at your appt. Dr. Says your not". Now this is my Second pregnancy, I have been sick as all hell this go around, tired, headaches, all the lovely first trimester stuff...and I keep getting the same remarks. One second discussing babys future and all happy then he makes a joke about me just making this up in my head. It is honestly getting really hurtful and stressing me out. First OB appt 1/6, cant wait just for this reason.