Could I be pregnant?

Okey dokey.. I really need some advice. Sooo, my boyfriend and I have sex regularly. We don't use a condom when we first start but towards the end, he'll put one on and finish. We've had two instances where he actually came inside me. The first time we got Plan B. The second time was about 3 weeks ago on the last day of my period. We were a little worried but we figured we'd be ok. So no Plan B. Now my period is usually always on time. Every 28 days and lasts about 5 days. I'll get cramps a few days before and that's how I know it's coming. But I haven't had any cramps, and I am now 2 days late. I've taken a pregnancy test about a week and a half ago but I did not pee on it long enough so I'm not too sure if that affects the result. It showed negative pretty quickly. I also didn't read the instructions and missed the part that said to take it on the first day of your missed period. I haven't really had any unusual symptoms. Although I have been extra tired and hungry. And really, really moody. I'm not one to get angry quickly but these past few days have surprised me lol. My whole body also gets sore from time to time, my back and feet especially. Oh, also the side of my breasts tend to get sore while in my bra & in the mornings (I don't sleep with a bra). Anyway, I don't know if that has to do with anything, I'm just putting it out there just in case it helps. I know this was quite a read but if you've made it this far, I'd greatly appreciate any advice. Thank you!