Help! Thank you!

Marie
Well. AF was due 10/1. On 9/30, I had sticky EWCM that was streaked brown and then later in the evening I had just normal brown discharge which I assumed was the start of period. The brown discharge happened again 10/1 in the morning and sporadically throughout the day (never consistent or very much) and then last night I had pink spotting. Today I've had more pink spotting and brown discharge (incredibly light, almost hardly there), period is still MIA, and I'm overwhelmed with nausea and a headache. Got BFN as well. I've never had this happen, especially the spotting, so any help or feedback would be appreciated!!!