Mini “gender reveal” for my husband - ideas needed!

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So we are doing <a href="https://glowing.com/glow-fertility-program">IVF</a> and have a scheduled transfer in 3 weeks! We aren’t going to be told the gender of our embryo until the day of our transfer. My husband can’t come into the transfer room with me (he has to wait in the car) because of covid. Which means I’m going to find out the gender before he does. He asked if I could do something fun to reveal the gender to him... but I know I’m not going to be able to wait to buy something afterwards to do a reveal to him later on, I’m going to want to tell him IMMEDIATELY... like, in the parking lot 😂

Any ideas for something inexpensive I can give him to reveal it to him in a fun way? Of course I’d have to get a boy version and a girl version because I won’t know which it is until a few minutes earlier lol, so that’s why I say inexpensive :p my husband said just to get a pink or blue piece of paper but I feel like I can do better than that hahaha.