First Pregnancy Right Off the Pill

My husband and I just ended birth control about a month and a half ago. Thinking that we wouldn't get pregnant right away, we weren't being super careful and had sex on the day after my most intense ovulation day (I ovulated on Saturday and we had sex Sunday afternoon). This was two weeks ago and my period was supposed to show up yesterday. It isn't here yet! My husband and I are really excited about the potential of being pregnant and I took a test yesterday (the day that should have been the first day of my period) and it was negative! ugh! When should I test again? Any way I could find out early? Anyone have any sure early symptoms? I've had to pee a lot, I've had breast tenderness, and I've had a few really intense cramps, I'm so so hoping they're implantation cramps!