39 days late

I missed my period in march and havent gotten it yet. I did have sex but it was Protected and was used very cautiously. I took 2 tests this month and they both came out negative, which put my mind at ease. Now im cramping up so why haven't i gotten it yet. I was stressing out over everything like work, school, college, driving school,& prom omg 🤦🏾‍♀️😂 Is that the case or is it something else?