My girlfriend has been constipated for days and can't sleep at night. nasal congestion too. could she be pregnant. we're currently not in a place where we can get a test. we had an incident where some semen touched the outside of her vagina?

Pregnancy from the limited exposure cited is not a plausible reason for constipation/sleeplessness or stuffy nose.

Since you say you don’t have access to a test, I might assume you are in the Wilde Ed’s hiking or camping. That being said the constipation and nasal congestion most likely is due to dehydration. She needs 80-100 oz of non caffeine/non alcoholic fluids per day sitting at a desk at home. If you are very active, you need to add 20 oz per 30 minutes of strenuous activity on top of the previous #.

From your scenario chances of pregnancy are near ) as the sperms have to enter inside the vagina to cause pregnancy.. ask her to tame Miralax and drink some water. Good luck.