I'm 16 and just started birth control 2 weeks ago and these are my symptoms
-nauseau
-bloating(not so much anymore)
-little tiny cramps that are very minor
-brown discharge for 2 days so far

The last time I had intercourse was 5 weeks ago and we used a condom & I took the plan b pill the next day just to be safe and had my period. Are the symptoms I'm having normal on birth control after 2 weeks?

Yes, these can be very common side effects to hormonal birth control. Are you using birth control pills? If so, see what happens when you would expect your next period. Pregnancy will be a slight possibility even with the use of a condom and plan b.