Am I potentially pregnant after genital contact with protection?

This could be due to various reasons like anxiety, stress, or even certain medical conditions. It's a must to have thorough communication with your partner and be as relaxed as possible during intercourse. Try out these techniques too; the start-stop method and consulting a doctor can be beneficial. 

Based on the information you have provided, the probability of pregnancy is almost zero since there was no intercourse and he came outside with ejaculation. Keep in mind that for the pregnancy to occur, the sperm should be in the vagina. If you're feeling nervous, you can always think about using protection in the future

Nightfall, or nocturnal emission, is a common occurrence in both men and women at the same time. In females, it is the body's way of releasing extra fluid. Nightfall will not affect your health or sex drive in any way. A nightfall patient will still be interested in sex after marriage. It's so natural. Just keep on living a healthy lifestyle, and all will be well.

After finishing the week-long treatment, it is still necessary to wait 7 days before you have sex again. The purpose of this is to let the antibiotics work properly and make sure the infection is gone. Besides, make sure your partner is also tested and treated if necessary to stop reinfection. 

Considering the circumstances, it is improbable that your girlfriend could become pregnant if there was no ejaculation. Nevertheless, it is good to realize that any genital contact has some risk involved. Therefore, if she starts experiencing any unusual signs like missing her periods or having abnormal bleeding; I advise you to go for a pregnancy test so that you can be sure about everything.