Producing colostrum for 3 weeks but not pregnant?

Missed my last AF March 29th. BFN for weeks. Had symptoms, started producing colostrum a week before going to obgyn. They found a cyst on ovaries and said it will figure itself out and see if my next AF comes. If not repeat sonogram in a month. 
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​I did some looking online and I couldn't find any connection with colostrum and overian cysts? My AF was supposed to start yesterday and no feeling of it coming. Past week my breasts have gone from fine to Do Not Touch Me sore. I figure just PMS for AF that's now late again.
​So if I'm not pregnant, why am I producing colostrum for about 3 weeks now? I know cysts affect hormones but prolactin? Any ideas? 
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