vaginapagina | Could I be pregnant?

I know there are ladies that ask this all the time, so bear with me...

My periods/cycles are strange, and I had two last month (I usually only have one), and I can't remember when the last one started so I have no idea when I may have been ovulating, or when I should expect my period, or when to know if and when I am late.

I have been having strange symptoms lately that I don't usually have, for example: frequent headaches, bloating all of the time, increased hunger and/or loss of appetite, and fatigue constantly, no matter how much sleep I get.

I'm not on HBC. We use condoms sometimes, most of the time we use withdrawal, which we've used for a long, long time.

To add to my paranoia, my grandma told me on Saturday that she thinks I am going to be pregnant before my aunt gives birth (I think my aunt is like, 4 or 5 months along), and that she is "never wrong." The thing is, she's really not... she's "predicted" more than a few of my aunt's and uncle's recent pregnancies/children. I haven't been able to stop thinking about that since Saturday.

I had been feeling all of these symptoms before she told me that, so I know it's not all in my head. Can anyone give me some insight? I usually start my period around the 7th of the month, but like I said I had two last month so I don't know what's going on with my cycle, or if it will come as usual on the 7th. Should I wait until then to take a test? Should I test before then?

Thanks in advance...