 [ Symptoms ] how contagious is chlamydia my now ex bf tested positive and i am negative my bf and i were pregnant i lost the baby but not before i got tested for all std is which all came back negative my bf and i did not have sex after we found out i was pregnant but just last week he called and told me he was positive for chlamydia how likely is it that i did not get it if he had it when we had unprotected sex for 3 months [ Disease ] it is very unlikely that you did not get an std while having unprotected sex with your boyfriend if he had chlamydia at that time as well if you have not had sex with him since you became pregnant and you tested negative i am sure you can do the math