Lighter period after lost virgnity, boyfriend used condom both times, and did not ejaculate

Hey everybody, im 22, and was a virgin untl a week ago. Also totally a newbie to all of this sex advice, so any insight is greatly appreciated. about three weeks ago, my boyfriend and i tried to have sex for the first time. I was a virgin, and was stupid enough to buy non- lubricated condoms, so after about 30 painful minutes we stopped, as he couldn't even get it halfway in without hurting me. About a week ago,(Monday night) we tried again, this time with lubricated, spermicidal condoms, and he succeded. It was still painful and I bled alot, but we had sex for probably about 5 minutes. It still hurt so I asked him to stop, and he did. He never ejaculated at all. I started my period on Friday, (2 days early) and it was normal, however since my cramps were heinous I took a painkiller and had a days bed rest. On saturday, my period was really light, and then today, on the third day, it got normal after I excercised, and then got really dark brown like at the nd of my period and then went away. Is it normal for periods to change like this after losing virginity, or should I be worried? what is the likelihood that i'm preganant, despite totally using condoms an no ejaculation on bfs part? am i just freaking out? help me!