There is a lot of information on Chlamydia and how it is spread.
There is room for doubt when it appears that unprotected sexual activity is the way it is spread.
Make an informed decision read up on it and understand your risks and the baby’s risks as well.
No doubt you were tested as well or are going to be.
If you are or could be the father of the baby you need to resolve this and put your mind at ease.
So it simply comes down to who had unprotected sex and that answer could also raise the question of who is the baby’s father if it was not you.
I copied this just to give you a bit of information on it.
Chlamydia, a common sexually transmitted infection (STI), is caused by the bacteria Chlamydia trachomatis. The only way chlamydia is spread is by sexual contact — specifically, when infected fluids (vaginal fluids, semen, and/or pre-cum) come into contact with mucous membranes. Both men and women can get chlamydia through vaginal, anal, and, less frequently, oral sex with an infected partner. Using a condom or dam during sex can reduce the risk of transmission. However, you can't get chlamydia by sharing the same bathroom or toilet seats with someone who's infected: the bacteria can't live for long outside of the body, and it's pretty unlikely that a person could come into contact with someone else's body fluids, even in the bathroom.
Because untreated chlamydia can cause serious complications — including inflammation of the urethra or reproductive organs, resulting in damage and even sterility — it's important that sexually active people get tested. The good news is that testing is usually done using a urine sample and chlamydia is easily cured with antibiotics.