need advice

I'm currently on a 39 day cycle period was supposed to come on Friday 16th of sept I know that I ovulated late ( I ovulated on the 7th sept) I had bit of cramping yesturday didn't think much of it, done a test this morning but bfn, had some spotting but only when I wipe it's got a pink tinge to it, do you think this could be immolation bleeding, never been pregnant so I don't have a clue, been trying to concieve for 10 months so hoping it's not af, thanks ladies 😊 xx