Pregnancy symptoms after a few weeks

Patient: I am taking cerazette mini pill, on the last day of the packet I forgot to the the pill that evening and and unprotected sex that night. I remembered an took the pill the next day maybe 11 hours late (approx) could i possible be pregnant? this was 17 days ago and I’ve been getting strange cramping and lower back pain pain the past week

Symptoms: Cramping, lower back pain, stomach feeling strange