Blighted Ovum

I got pregnant unexpectedly because I have very irregular periods. I took HPT and got positive. After a month, I got severe cramps on my abdomen and pelvic area so I visited my doctor to see if what could be wrong. She had me into transvaginal ultrasound and she told me that I'm 6 weeks pregnant and found a very faint heartbeat of my baby. On my 8th-week of pregnancy, I went back to my doctor for another ultrasound but she found no hearbeat anymore. She said I had blighted ovum. I feel so sad...this could be my first baby...but it was gone...