Mommies so there's a possibility I cant make it to do my glucose test at all this week. The dr kept telling me its a…

Mommies so there's a possibility I cant make it to do my glucose test at all this week. The dr kept telling me its a walk in but now they said its an appointment and it has to be done by Friday cause im 25 weeks already. I have no ride cause everyone works in the AM, no money for uber or a taxi and no one to watch Drew while I go for the 2 hours. My dr doesn't do it any more at the clinic it has to be done at the hospital where I'll deliver. I know its important to take it but is it mandatory? Will they make me do it during the 3rd trimester?