OK so me and my boyfriend had sex on aug. 10, aug 13, and aug. 17. All these we didn't use a comdem and he came in me all three times, well then I have this mycycle thing that helps me predict my periods and I was suppose to start on aug. 18 but I didn't start until the 20th, and it ended aug.24. So what I was really wondering is if I could be pregnant? I took a pregnancy today and it turned up negative, could this mean its to early to tell? I just need some help also today I started feeling kind of sharp pains in mt stomach it was on my left side then moved to my whole lower stomach I was just wondering if there is a possibility of me being pregnant?