Confused n worried

I’m 7th week pregnant. When I saw my Gynae at 6th week, she commented that the sac looks small and advise me to come back on my 8th week. N when I asked, she say it doesn’t look optimistic. What should I do now? So far, my symptoms are only breast soreness at 4-6th week, but it’s going away ie no soreness feeling now I have a bad feeling :(