Case 1: It is not an ectopic pregnancy because it said that it was repeated every month, that is, the pelvic pain appears with each menstruation. in any case I would do a pregnancy test or human gonadotrophin levels.
In Case 2, the differential diagnoses would be Lyme disease, but they do not mention skin lesions in the description. it occurs more in wooded regions, but I don´t know the region where the patient lives.