Confused. Please help Ladies!

Caroline
Hey ladies. 
I have a question. First of all, I have PCOS, so I am not very experienced in how a "regular" cycle looks or how cervical mucus changes during a cycle. Just because I my cycle is non existing. My mucus is always creamy, sometimes more sometimes less (amount). 
BUT. Since two days my nipples (sorry🙊) hurt like crazy if I touch them and are hard and somehow darker?🤔 my lower stomach hurts since last night like I am going to get my period. But there is nothing coming. And few minutes ago I was peeing and after I wiped, I saw a clot of "eggwhite". 
What does this mean? Am I ovulating? 
(Had no period since MONTHS btw) . 
Yesterday I was so scared to be pregnant, took a test and it came iut negative. We use condoms, so I know that the chances to be pregant are veeeery very low (due to condoms and PCOS) but I cant figure out what it was because of the hard and hurting nipples... 
I am german, so please excuse if my english is not that good! 🙏🏻 thanks for your advice!