Yes, you can get pregnant if you and your partner have chlamydia.
NO... That's not how you get pregnant.
If your partner did not touch your body with his erect penis in any way, you can not get pregnant. But if he was inside you and pulled out to come, then yes, you could be pregnant.
yes there is a chance that you can become pregnant from you partner pulling out without a condom
No it is not. It is good for you, if anything. Except if your partner has a sexually transmitted disease, or the two of you are not using protection against her getting pregnant.
If you're having trouble getting pregnant, talking to your doctor is the best first step to take. Your doctor can rule out anything that might be keeping you from getting pregnant. If you find out either you or your partner are not able to reproduce, fertility clinics exist to help you become pregnant.
If you have had sex then yes you could be pregnant, regardless of whether your partner had had any experience prior to you.