20 week anatomy scan

My midwife just texted letting me know that when I go to my scan next week I need to ask for my flu jab and whooping cough vaccine. I’ve never had the whooping cough, I’m sure I had a flu jab but when I was younger.. this is my first pregnancy and I’m currently 20 weeks (I’ll be 20 weeks and 6 days when I go for my scan) . I was wondering would I get it at the hospital right after I have my scan? I did have a blood test for downs with my first scan and that was straight after my scan. Also will it hurt? Anything I should know in advance?