New to all this, advice needed

Jessica
Ok so my BF and I have been NTNP and I'm going to make this short
5/7 first day of my regular AF
BD 5/18, 5/19, 5/20
AF due on 6/3 - didn't come
6/13 - 6/15 1 day of light bleeding and 2 days of brown spotting (which is not normal)
6/17 BFN 
6/24 positive opk
6/25 BD
We aren't going to have a chance to BD again during this window because of his work schedule😔
My question is, do I have a chance? Today I have had light cramping in my lower abdomen and it alternates between sides. I have also had really "creamy like" CM/discharge. And quite a bit of it.

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