Possible pregnancy

Patient: I have the mirena in one year now and have been experiencing some odd symptoms and I don’t want to over react if pregnancy could be the reason i was also taking antibiotics four weeks ago I don’t know if that can be a factor of becoming pregnant . These are my symptoms; irregular bleeding I’ve had light bleeding two times in 4 days apart, continuously having lower back pain, hunrgry all the time, moody, frequent headaches, feeling of flutters in my lower abdomen. I don’t know what to think could I be pregnant?