Ectopic???

I found out on Saturday I am pregnant, a clearblue test said I am 1-2 weeks. I have been getting stomach cramps so at the suggestion of the GP went to the early pregnancy unit this morning. They did a vaginal ultrasound. She said she could not see a gestational sac or anything. However she did say she saw a 'mass' on one of my ovaries. She said it could be a cyst (I have pcos) or it could be an ectopic pregnancy :( I had bloods done today and have to go back on Wednesday for more to see the change in HCG levels. What are the chances of everything working out okay? Has anyone been through this and had a healthy baby? Thanks