i don't know how to feel

I'm 17 years old and have been dating my best friend of 8 years for nearly a year now. This may be tmi, but about 5 weeks ago or so we gave ourselves to each other for the first time. I've been getting dizzy spells, nausea at random moments, minor pains (enough to be uncomfortable), and sudden hot flashes that last about minute. I went to the nurse and my temperature is fine and my BP is perfect and she can't seem to think of anything wrong. We, me and my boyfriend, started talking and he asked me to take a pregnancy test to make him feel better. Don't get me wrong! We've spoken of having kids for a while and as I'm waiting on the test, I go out to ask for my phone for a timer. I could see it in his eyes he was excited. He always wanted to be a father. When the results were done, I went out to tell him is was negative. He wasn't disappointed but he wanted to make sure I was ok. I don't know how I feel, i really don't. I am happy to know, but I also feel....lost? (if that's the right word)

I need advice or tips or something, I don't know what my question is but maybe some of you will understand.