Hi, I am a 30 year old woman mother to a 8 year old and a 2 years and 7 months old, both born via c- section. I have an IUD, and my period is very exact, it never comes late, until now, that I´m 8 days delayed. I had a HPT on the fourth day of missing my period and it came out negative. Today (the 8th day of no period) I went to my obgyn and had an ultrasound and a sac was detected but no embryo. I had another HPT and it´s negative again. Am I pregnant or what else could it be? My obgyn says it´s hopefully a baby, because otherwise it might be a clot or something like that. I´m worried.