Feeling impatient!

Michelle
My boyfriend and I are trying to conceive our first child together. This would be his and my second, but first together. He "planted his seed" 9/4, 9/7-9/10. Well the last 2 days I've had slight cramps, very low, and this may be tmi but my stool for the last 2days as well has been really loose; also been very fatigued. I took a test this morning, it was negative as expected lol, but I'm jus getting impatient...I wanna know! I assume that if We have conceived it would of been from the first time he "planted his seed" lol cause the other days are obviously too soon, but What do y'all think??? Am I jus convincing myself that I might be pregnant? Or is it implantation that I'm feeling?