I have been having pains in my lower left side of my stomach for about a week now. I have had very painful breast tenderness and nipple pains. I feel bloated and in pain a lot. I feel nauseous most of the day. What can this be?
I have not been on birth control for almost a month now.

I could be from not being on birth control, it could be many things. These are signs, but also for so many other things, and many women never get early signs at all.

So question, I will assume you are trying to get pregnant, since you stopped birth control?
When is your next period due? And really till it is time for your period, and if you miss, and take a HPT, that is really the only way to know at this point