TTC thoughts

AF has been typically on schedule, just varies by a few days each month. I tested and figured I ovulated somewhere between dec 8-13. Around dec 17 I began to feel small cramps, but they weren't consistent. I would feel them and then they would go away. This went on for a few days. It even got to the point where it felt like they were on the left side, almost making my entire leg a little crampy, and towards the end of the few days they became more centralized. AF was due dec 23. I've tested then and tested today and both times I've gotten bfn. Not sure if there's any hope that I might be pregnant or to expect AF. I'm reaching out to see if anyone's ever experienced similar sensations prior to a bfp or their period. I've typically feel cramps before AF but these were significantly diff. Your thoughts are greatly appreciate!