Period late. Am I pregnant?πŸ’•

Elizabeth β€’ Can not wait for our little bundle of joy!
This is the first month my boyfriend and I were trying. I stopped taking my birth control pills, I started taking prenatal vitamins, I took ovulation prediction tests, we had sex every night for about a week, which was during I was fertile and ovulating.Β 
My period is only 2 days late. But I took one test a day for the past 4 days. All of them were negative. What do you think it is? Could it just be the tests or the fact that I just stopped taking the pill? I finished the rest of the pack of course. Someone help!Β