If you're due to start your period and your boyfriend fingers you, can fingering stop you from coming on your period or make you a little late?

Ok, I'm almost 14 and I have not started my period yet. I'm short (4 foot 11 inches) and I don't know if that would affect me not having it yet. I have cramps like the ones you would have before your period but then...nothing. I'm an active person, but normally active, not overly active and not a couch potato. All of my friends at school have already started. Although I'm glad I don't have to worry about something else in my life, I don't know if its normal or not for me not to have my period. Please help, thanks!

Can you have sex when you have your period? If so, how?

I'm 14 years old and a virgin. When I explore myself or masturbate I find that I can fit at least 3 fingers inside myself without much discomfort. I haven't had sex and yet it feels like I'm stretched out or something. Could this mean that I really am just loose? I mean I've been fingered by my boyfriend before but never anything else.
Shouldn't my hymen be intact? My friend told me that the heavier your period flow is how wideset you are *downthere*. What could she mean by that? I'm so confused and embarrassed that I don't know better. Please help.

I was supposed to get my period about 2 weeks ago and although my periods are never exact and to the day, they usually aren't that late. But about 4 days ago I started getting brown spotting, like old blood, which sometimes signals the begginning of my cycle, so I was quite relieved. But I've been getting this exact same brown spotting for the past 4 days and it's really confusing and worrying me. The only sign of any actual flow I've had is right after I went for a run yesterday and there was just a tiny tiny bit of actual red color. I took a thorough biology course and I know a lot about the menstrual cycle and pregnancy and all the hormones involved and that knowledge is making me paranoid I think (and I'm already a worry wart by nature). I just can't figure out, hormone-wise, why I wouldn't be shedding my endometrium, unless my progesterone levels haven't in fact dropped - indicating pregnancy. I am still a proud virgin at 18, but about 2 and a half weeks ago my boyfriend and I fooled around. He didn't ejaculate anywhere near me. The only thing I'm worried about is that maybe his semen (or pre-cum) got on one of our hands and it came into contact with me, and I know that even then, the chances of the 100 odd sperm actually making it all the way to my fallopian tubes is slim to none, (especially since he didn't finger me, and that I most likely had already finished ovulating by then considering I was supposed to get my period any day, at the time). It's just worrying me because my periods have never done anything odd like this, and on top of that, that was the first time I've fooled around before. Coincidence?? I'm just wondering if you have any alternate conclusions, which I hope are more plausible than mine, for this prolongued brown spotting. It'd be nice to have my mind at ease :)

And I just wanted to add that even though I'm not a regular to this site, I have been using it for the past 4 years when I have any questions and you're always so quick to reply and non-judgemental. I appreciate it and it's great to know that everytime I need questions answered I have somewhere to go!