I had my period for five months but last month I didn't. I haven't had pregnancy symptoms but my boobs have hurt really bad and my stomach is getting a little larger. I have constant food cravings and I'm always eating.

Did you have sex?

If you have skipped a period, and you have sore breasts, you need to get a pregnancy test.
How old are you? You can go to a planned parenthood to get a test done.
And get you birth control if you are not pregnant yet.

First normally there is no "signs" until you actually miss you period. So have you missed a period.

Had sex 6 months ago and only missed last month's period but my other periods were always off

After 6 months you are not pregnant unless you have had sex since then.

How old are you? Its common for younger girls to skip periods every now and then.
Stress and sports can also make you skip

I'm 18