So I really wanted to have a gender reveal party (for my immediate family)/ pregnancy reveal (for my…

So I really wanted to have a gender reveal party (for my immediate family)/ pregnancy reveal (for my family that hasn't seen me)/ birthday party on my bday or the 12th since my bday is election day. I had everything perfectly planned out. A couple things I hadn't had planned out like the place or day cuz election day won't work for some and the12th won't for others. Today I asked my mom for help conflicting things. I explained my plan to her and she said its not gonna work because I'm going to see my obg just for my sugar glucose test. My doctor said that at my next appointment ask them to confirm the gender of my baby after the guy at the hospital told me I'm having a girl. But my mom said it'd have to be at my next ultrasound which is December 1st. A Christmas reveal would be cute but it just completely throws off everything I had planned out. I still wanna have my reveal party on my birthday. So if my obg can't confirm it at my upcoming appointment then how can I get an accurate test result for my baby's gender before election day. Preferably low cost at that cuz this party will be huge and expensive.