Who do I call?

Hi so this might sound really stupid and I never take to apps for this kind of thing, but im about 11/12 weeks pregnant with my second child and honestly all I've felt is weak and dizzy. Problem is I don't know who I'm supposed to phone? Is it my gp? Is it the midwife? Is it the early pregnancy unit incase somethings wrong? Honestly I might sound stupid but I don't have a clue where it is your supposed to turn to, I had my daughter during covid and was basically left to my own devices, luckily I had no issues but I don't know I just don't feel right. Thank you for your help if you can 🥰