Should I take the test?! (Pregnant?/Cystic fibrosis)

So I really don't know if I am pregnant or not and I am REALLY scared. I'm 19 and about to go in to university. 
I also am not sure if I should take a pill test and it's really hard to tell!
CF is a disease that affects the lungs and digestive system.
My symptoms:
-constipation (pregnant??, meds or CF)
- nausea 
- weird ass period
- NO cravings 
The medication I'm on right now has quite a bit of symptoms to come along with it. One of the symptoms that it comes with is nausea dizziness diarrhea and abdominal discomfort. I haven't really noticed myself eating or craving a lot more. 
The reason I'm saying my period is so weird is because it would be the brown tinged discolored discharge or blood and it would be a small bit of blood to but consistent. 

Glow Resources

Let’s Glow

Glow is here for you on your path to pregnancy

Glow helps you navigate your fertility journey with smart tools, personalized insights, and guidance from medical experts who understand what matters most.

25+ million

Users

4.8 stars

200k+ app ratings

20+

Medical advisors