It's possible it could be pregnancy, but your body is probably going insane due to all the different birth controls you were on in such a short span of time, coupled with taking them improperly. (missing pills and such) The first thing to do would be to even see if you're pregnant, and a blood test could definitely tell you that. It's possible to lactate even when not pregnant, and I know some women who have years after they've had children.
It could be a symptom, but if you've been pregnant before it could just be from the hormones in the birth control and nipple stimulation.
A blood test isn't necessarily going to pick up before a urine test. Many over the counter urine tests are more sensitive than the blood tests doctors use. Many are even more sensitive than the urine test strips at the docs office.
Honestly I think your body is thoroughly confused from all the switching of birth control methods. Once your body has time to readjust to regulating the hormone production without the synthetic hormones the lactation may cease. It could take several months for your body to fully readjust.
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