Feeling bloated period is 4 days late. engaged in protected sexual activity 3 weeks ago, he did not finish and no problems with condom. test was negat?

Maybe something else: The hormone cycle at your age can still varying in intensity and occasional cause a slight irregularity. Good that you are taking precautions. Repeat the test again in a week if still no cycle. Consider constipation - very common in females that can lead to bloatedness. Drink plenty of water/good fiber intake like veges/popcorn. OTC Miralax (polyethylene glycol) if this not helping. Good luck!