Okay let me start with I'm 19 and have had chlamydia once for a few months(so I'm not sure if it did any damage). It was like 3 years ago. I've been having some strange things go on, like last month my period was 3 days instead of my usual 5 or 6 days. My breast have bright blue veins showing on them. My breast are also getting bigger out of no where. I've been getting extremely hot out of no where for the past month(sweating even when its cold). Been extremely fatigued lately, and having mood swings like crazy. I have never been pregnant so I'm not sure what's going on. Opinions would be great!

Of course what is your age? But yes at times a period of only a couple days could be a sign, Have you taken ( I assume not) a home pregnancy test yet. I would say it may show by now.
** I also assume you are having sex.

Would be good to know what's going on because the same is happening to me as well. The same things.