NEED ADVICE PLS🙈🙉

Jenise
My bf & I had sex on 3 days that I was fertile, no protection & he didn't pull out. This was about 2-3 weeks ago. My period was supposed to come last Friday but it didn't. I was told to take a pregnancy test by a friend & it was negative. But for the past week I've been having heat flashes, been very irritable, had pain on & off in my breasts, & restless legs. Is it possible that I am pregnant & I tested too early?