Slightly stressed...

I took 3 tests from work yesterday and they all came up positive and then I took store bought ones today and negative. It says online that the ones from my work maybe more sensitive to detecting hcg and the store ones sometimes take longer. I don't know if I should be celebrating or not. I'm 10 dpo and my period is due in 2 days. My breasts are sore and I'm so tired. I have also been testing myself with the same tests for the last few days and I was shocked when it came up positive last night 3x in a row. Thoughts ladies??? Do you thinks I could be pregnant? 🙏🏻🤰🏻💞