Pregnancy test result was negative. Could I still be pregnant?

My period is 2 weeks late now. I am experiencing slight back pain and cramps just like when I have my period. We used protection and were really careful but I still worry because I haven't got my period yet. Pregnancy test showed negative result.
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I got 3 more negative results. I was so confused but thank God my period came today. After 22 days of waiting, it finally came! I'm glad I'm not pregnant. I'll be more careful from now on. Condom is not enough! Hahaha
Pregnancy test result was negative. Could I still be pregnant?
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