Hallow Dear,
You have two aims in front of you:
1. To find out whether you are pregnant or not: If the
hCG levels are unable to detect your
pregnancy, you may have to rely on the ultrasonography views. If
abdominal ultrasonography vision is obliterated by the
dermoid cyst, you may opt for ultrasonography by probe in the vagina or
rectum. Probably after few days, the picture may be more suggestive.
2. Take a decision about what is to be done with the dermoid cyst. The advice depends upon the site and size of the cyst. Your Obstetrician is the best adviser for this since he knows these details. Now-a-days, such cysts can be dealt Laparoscopically even during the pregnancy. However, as I suggested you, your Obstetrician will be the best judge.
I would appreciate if you upload your reports and images of ultrasonography by asking me a Direct Question. Then I may be better poised to guide you further. You can do that by visiting my Profile.
I hope, this helps you for the time being.
Take care please,
Dr. Nishikant Shrotri