So could I be in the 'family way'?

I am 17 years old, closeish to 18. My boyfriend and I have been together for a year as of next month... For the past seven months or so I have been on the pill, but the side effects were getting so bad. (mild weight gain, sore nipples, and I am bipolar so the mood swings were ridiculous.) So I stopped taking them last month, pledging to use condoms. We did, 2 out of 4 times.... He pulled out the two times that we didn't use one. I am VERY in-tune with my body, and during the first week after my last period I noticed something different. Slight nausea and lightheadedness... Then lately I have noticed that I've been urinating a bit more than usual and that my breasts are swollen. I'm also crampy and bloated. But the thing is that today, I was supposed to start my period. So those symptoms could be contributed to that. The only problem is that I didn't start today. I am normally very regular, even before I was on birth control. Also, I have had this EXTREME craving for particular Mexican foods, and when I eat them it's like the most satisfying thing I have ever eaten. And I've been going to bed 2 hours or so earlier from how tired I am. So could I be in the 'family way'? If it is possible, when should I take a test?