I conceived via IUI with Follistim 200 for 7 days and 1 shot of Olvidrel to induce ovulation and a booster 7 days after. My LMP was 01/22/2009, I had 2 IUI's in February 2nd & 3rd and I had 2 eggs on February 1st one @ 15 and the other one @ 14. On 2/17/2009 I had a PPT with my HCG levels at 125 (that would be exactly days 15 & 16 after the (2) IUI's). Then I went back on the 19th (2 days later) and my HCG level was 600.... What are the chances that I am carrying twins??? I am confused since I could of gotten pregnant either day and I am not sure if that issue would of made a signifcant difference. I will have my U/S in 2 days however I was also told that sometimes it does not show.... Pleas help....

Thanks