???????

So my period is very irregular. In november i got it the 23rd. Dec i got it the 31st then february i got it the 4th. I had sex feb 26th. It was protected and even with the condom he pulled out and we checked to make sure there were no holes. i still hadn’t gotten my period and i took a test 2 days ago. I took two and they both came out negative. I can’t be pregnant right now i can’t. Am i just stressing out too much?