I was diagnosed with an ovarian cyst last month, when I missed my period. I have had a tubal ligation so I was concerned with the missed period. I am now on my second missed period, and getting really concerned. I have no signs of it even coming soon. Could this be a pregnancy? Should I do another pregnancy test to be sure? I feel like I shouldn't worry because the doctor did a sonogram to find the cyst. Wouldn't they have known about a pregnancy. If anyone could help, I would greatly appreciate it. My mind is going crazy with this. I have NEVER missed my period like this, other than with my 2 pregnancies.