Don't worry, I had the same thing and i too am a worry wart. I went in for an U/S at 5 weeks (for spotting) and was told I had two cysts on my left ovary. I was panicked at first but my doctor was not concerned. He said pregnancy was great for shrinking cysts. I had them monitored with each U/S and at my 20 week ultrasound there was no evidence that the cysts had even been there and I went on to have a very healthy and happy baby boy.