5cm cyst

Hi, so at my 12 weeks scan yesterday they found a 5cm cyst between my ovary and tube..

They were just a bit like don't worry we will do a scan in 2-3 weeks and see if it's reducing in size but in the mean time no strenuous activity or heavy lifting and if you have pain bleeding or feel unwell go immediately to a and e as it could be a medical emergency..

So that did not make me feel better..

Then today on my lunch break at work I got a phone call as they have booked an urgent pelvic scan for Monday.. Again now I'm really worried..

Anyone had any experience with anything like this?