Ay mama, ito talaga ay importante kaya please check with your OB as soon as possible, every pregnancy with a cyst is different, and your doctor needs to monitor it closely para ma-ensure na lahat ay okay sa baby and sa iyo. One of my mum friends had a cyst discovered during pregnancy and her doctor gave her specific dietary advice based on her situation, kaya talaga ang best source is your own OB na nakikita ang ultrasound results mo. In the meantime, I'd say stick to light, healthy foods, lots of fruits, vegetables, and protein, pero wag mag-assume ng specific restrictions without checking with your doctor first, ha?