Light pink/brown spotting & moderate cramps ?

Diamond • Florida. 19 yrs young. Certified Medical Assistant
I'm on CD 24 and according to Glow I'm 4DPO. (I think I ovulated sooner though) Right now I'm having cramps that feel like a period. It's like dull achy cramps, but my AF isn't due until 10/23 my LMP was 09/20. My cycle is 33 days. I'm TTC #1 and I've never experienced this before. What could this be ladies?