I posted a response and my message disappeared. It was just to say the idea of stds causing ectopic pregnancies is it causes abnormalities to your tubes causing the embryo to get stuck. The doctors said your tubes looked fine. Sometimes there is no cause or reason an ectopic happens early pregnancy is very unknown and docs just guess. Sometimes unfortunately it is just down to bad luck. I know that’s hard to hear. But if you are worried you should have a std test.