Just been treated for chlamydia periods normally regular two early two weeks apart second one is dark brown very low flow with 3 other symptoms?

Chlamydia: One of the frequent symptoms of chlamydia is abnormal bleeding. Now that you have been treated this should get better. If it doesn't, get back to the doctor for more testing. Hopefully you tested negative for other STDs since having one increases the risk of others. This is a reminder to use condoms to decrease the risk of STDs. Hope this helps.