af or implantation? HELP!

Can't tell if this is a beginning of AF or implantation. Been having cramping off and on since Wednesday. bbt dropped on Thursday and Friday and then rose .5 degrees today. Some nausea but it mostly feels like butterflies kind of not like I'm really sick. Spotting since yesterday morning. It alternates between brown and pink. Isn't always there when I wipe, but sometimes. Here is a picture of what I just had when I wiped. Any help is appreciated! AF was supposed to come on the 7th and hasn't yet, but I do have irregular periods since I just got off BC in June. Haven't tested bc I am waiting to see if AF shows up so I don't have to waste a test. Thanks!

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