12 dpo. pregnancy symptoms with bfn

okay so i am 12 dpo and i have had symptoms for about a week they are getting worse. my breasts hurt and nips. hurt and itch and seemed to go up a size or two. my belly is swollen. i had nausea this morning. i have been super tired. i have taken htp and get bfn but i took opk test since the 26th of oct and have faint positives. i have read in pcos that women get false negatives for hpt but show up on opk.

i have been pretty regular since loosing 100 lbs and AF was due the 30th. nothing. thoughts?