im 17 n i think im pregnant bit idk

i am seventeen and my last period was june seventh but it was very light and there were no clots it lasted eight days. but i wasn't even supposed to start on the seventh, i was supposed to start on the fourteenth. and on july twenty first i had a single pink spot on my underwear and nothing more than that. my period isn't always regular but if its off its never late, its early, and usually by no more then a few days. but most of the time my period is every twenty eight days. well it is now july fourteenth and i am ten days late on my period, and i had a light discharge went i went to the bathroom earlier. my breasts are swollen and tender-actually very tender, i can't even take shower and let the water run on them because it hurts. i have cramps like my period but they've been coming and going for about two weeks now, but still no period. i don't have cravings but there are a few foods that now when i look at them i lose my appetite when im not normally a picky eater. i do have some bloating, but again no period. i have no experience with pregnancy but friends and people i work with have asked me if i was pregnant because of my mood swings, but i didn't even notice until they pointed it out. but i also have a history of bipolar tendencies but this isn't like that...for example one day i was just totally drained, like i didn't have energy for any thing, my fiancé tried to get me to play some board games with him to cheer me up, but i didn't want to play anything, so finally-jokingly- he said "thats it we're playing uno and there's nothing you can do about it" and he grabbed the cards and started dealing them out. well that really upset me and i started crying, i mean i was just bawling- you'd have thought my best friend had died if you had seen me. then when he tried to ask me what was wrong i was instantly furious with him like it should have been obvious and i started yelling at him out of no where about a bunch of stuff that didn't make any sense. and then just as quickly as i started crying and got furious it was gone and i was just drained again. but thats the only time that any thing like that has happened, there's been other times where i got mad or started crying for something stupid but thats the only time it was that bad. and I've been sleeping a lot too like for the past two weeks i sleep all night wake up for a few hours then go back to bed take a sometimes two to three hour nap and get up for a little while longer then feel the need for another nap, so i'll take another nap for about an hour then get up for a few more hours then decide it's been a long tiring day and i need to go to bed early. this is all so crazy to me and i really need some input so if there's anyone that can give me some advice please do. oh and also i will be taking a pregnancy test next week if i still haven't started i just need some words of wisdom now. please anything helps even if your telling me im a stupid id**t please,please respond, and quickly if at all possible because i wont have access to a computer after july seventeenth. thank you.