AF is due today, 14 dpo. Woke up to pee & when I wiped, had some pink cm.  No cramps, just twinges, which is totally unusual for me. Usually wake up to full blown cramps & bright red flow day AF is due. Peed again a few hours later, now brownish red spotting when I wiped. Took an OPK cause it's all I have, and it's positive. Do you think I could have an LH surge at the start of my period? Or should I head out to get an hcg? (Took a digit at 13dpo, which was negative) (I don't have pcos or irregular periods)