FALL RIVER – The pandemic begat social distancing, but even that apparently has its limits. “It doesn’t mean they are not going to have sex,” said Teresa Larkin, executive director of Your Options Medical. The Revere-based nonprofit agency for more than 30 years has offered free, confidential medical services “for women facing unplanned or unexpected pregnancies,” according to its website. In addition to Revere, it has a Fall River office on the ground floor of 25 N. Main St., a third location in Sturbridge and a fourth planned for Brookline. It initially got its start in Dorchester. The agency’s services begin with on-premises “lab-quality” pregnancy testing.