Hi, I had a transvaginal ultrasound performed on 7/25/2014, in which it was stated that a "small cystic structure is noted in the endometrial cavity measuring .2cm. Its etiology is uncertain. The possibility of a very early gestational sac cannot be ruled out." It was also noted that my endometrial complex was .8cm in size. Is that normal? I'm 28 years old, and have several small cysts and fibroids in my uterus, ovaries and cervix.

I took a home pregnancy test and it is negative, and I am not sure what to think. I think the ultrasound was performed 5 days after unprotected sex, which I think might be too early to detect a pregnancy. My period is late, but has never really been regular. I have also had light cramps for about a week now, but no period.

Could I be pregnant? What could it possibly be?

Define late? If you have irregular periods, being off by a month might not be considered late. Wait for about two weeks after the latest your period could come,Take a running average and test then. You could be pregnant, but it could be a cyst. The late period, if it is in fact late, speaks towards pregnancy.

Good luck!