follicle on left ovary?!

So I went to hospital a couple days ago and I was 3 weeks and 5 days pregnant my hcg was 71 and on my vaginal ultra sound said there was a large mass that was 1.6 cm  said it could represent a follicle has anyone had one of these in early pregnancy should I be worried plz comment! I'm 4 weeks and 2 days now!

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