Im Not Sure If Im Pregnant Or Not...so I Need Help

I've been reading and searching the web to know what kinds of symptoms should be occuring if I happen to be pregnant...Im 18 and i've only seen a couple of them but still not sure or convinced I am. Can it be my age or just that everyones different that im not having all the symptoms they say its already been a little over a month and im not sure if I should take the pregnancy test just yet. I would like to know what kinds of symptons I should've already expirienced by now and what I should b expiriencing. One of the symptoms was morning sickness buh I dont believe i've had that, I have felt a little sick at times but I haven't thrown up. My brest have been sore and tender, and already I see that my lower stomach is a little bigger than how it used to be. I also have felt a little pressure on my lower stomach, hungrier at times and my stomach has been a little more sensative. I have no idea of what this can be or why...But im hoping I really am pregnant ...I hate feeling pregnant and turn out it being a false alarm...One more thing, is there ways you can find out the sex of ur baby just by looks b4 you r even told by the doctor after your ultrasound?