Implantation cramps 7 dpo????

Tiffany

I’m currently 7dpo and I’ve been having cramps. Af isn’t due until the end of next week. Is it possible for it to be implantation cramping or is to soon for that and it’s just pre-menstrual cramps? I Should also add I’m on cd 26 and I took femara cd 3-7. I don’t know of that is going to affect the timing of af such as coming earlier than expected. Thanks