friends with newly discovered BFP!!

I was just wondering how soon symptoms occurred and how suddle they crept up. I am about 12 days dpo my boyfriend and I had unprotected sex more than a couple times this month, mostly around the time I could possibly ovulate... I say it like that only because AF is pretty irregular lately ( I just turned 22 and have had quite a lot of stress due to personal situations) so that's probably why AF has been going bonkers. Anyways, my breasts usually get a cup size bigger and fairly tender right before AF starts.. and the tenderness usually starts off on the sides of each boob. Besides that I never really notice many symptoms.. i eat a lot of sweets (mostly chocolate), and the night before I'll get pretty intense cramps that make me say "yup my period is on it's way". However lately I've been noticing my breasts are quite sensitive more towards the center of my breast.. I wouldn't say the nipple but the breast tissue maybe.. they've recently today just started feeling slightly uncomfortable with a burning sensation when I have my bra on.. but there are no color changes in the areola and my breast aren't swollen nearly as much as even when I'm pmsing. I notice dark veins but only when I really look although my nipple does look a little bigger in size. Also recently just noticed my right shoulder is killing me it kind of seems like my breasts might have something to do with it even though they aren't bigger than usual. I did have very slight cramps like when I say slight I mean barley noticeable almost like I needdd to pass a little gas (sorry tmi). But it soon went away. Also yesterday I took a shower and when I got out I had to pee right at the moment.. as soon as I sat down on the toilet it was like the smallest amount of per ever almost like a UTI but without the burning or bladder discomfort. I haven't had any discharge at all like i usually do during pms... I also didn't have much of an appetite at all, unless I made myself eat .. it wouldn't make me sick or anything I just didn't feel the desire to eat. Also have been pretty constipated but that could be because I haven't been eating like normal.. people have actually told me I lost weight which is weird to me. But as of yesterday i crave spicy, I usually like spicy anyways but it's all I can think about... nothing like usual pms when I'm eating every chocolate in the world. Also have had no insterest in drinking alcohol.. I went out 4 nights ago and couldn't even finish my drink I thought it was terrible and it's the alcohol I usually drink on any occasion normally. Also have been super tired and I don't do anything different.. besides maybe sleep more actually. It sometimes can be overwhelming because I have to wake up at 530am to be at the school I teach at for 630am but I've been doing it for 6 months and never really have a problem with it before. Everything is either a sick coincidence or brand new pms symptoms for me.. but I just needed your input on symptoms and experiences before I drive myself up a wall!