Update on Pregnancy of unknown location

Well after spotting for several days, passing a huge blood clot and 4 ultrasounds with no fetus in sight any where I'm officially out the race! My last HCG level was 1880 on Tuesday and when they checked Friday it went down to the 1700's! I'm not even experiencing any pregnant symptoms anymore! My doctor wants to give me the shot but I don't want to take it because they don't see a baby any where so why should I take it! When I go in tomorrow to do my last HCG draw I'm going to ask her do she think I has a blighted ovum. I never experienced or went through anything like this! Every time I got pregnant there has been a baby! This really just messed me up a little!