I recently had protected sex with an escort and I am worried I have caught chlamydia and transmitted it to my GF who is now having sharp pains in her lower abdomen and a prologoned period. She has irregular periods due to the implant but she believes this pain to be different. What could be the possible causes of this and could it be chlamydia? When I had sex with the escort I wore protection and lasted for little over 3-5 minutes.