I have a pregnancy question. will someone please help me!?

i am 26 years old and had unprotected with my boyfriend. it was 2 days before my cycle. i am pretty regular, and my period isnt usually too heavy, its right in the middle and lasts 3 days. i know its not the most fertile time to get pregnant, but there is a chance. and sperm lives for 5 days. well i did start my period, it was light and spotty. but did last 3 days. and yesterday i got really tired really fast and all i wanted to do was sleep. today i wake up and i have the weirdest feeling in my stomach, it feels like cramps,but not as bad. i didnt really start thinking about it until yesterday so i dont think i am psyching myself out, but when is too early to take a test? it has been 2 weeks since our little incident..is that too early? should i just wait until closer to my next cycle? thanks for the help!