Is it possible to get a positive test at 3 weeks?

Diamond
Currently I am in my two week wait. All this week I have had cramps and lower back pain/cramps. And my boobs have been sore as well, getting worse each day. Today I woke up and they're swollen! My period is due next Friday. I want to test tomorrow but I don't know if it's too soon. Please all advice would help ☺️

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