Today is my appointment in my ob and my apt time is 4pm but they want me to check in at 3:45 and its…

Today is my appointment in my ob and my apt time is 4pm but they want me to check in at 3:45 and its like almost 20 minutes drives away from my house if its not traffic uhg. Last time I came on time and they have me waited more than 45 minutes wth. Thank god I came early today 20 minutes early!! Geez I don't understand why they want me to check in 15 minutes early than my actual apt time. 😑😑😑