I'm very nauseaus can't even smell food and my boobs tend to hurt at times but I also have a stuffy nose a low fever and a really bad migraine headache could I be pregnant? Or it's just a cold? I mean me and my boyfriend had unprotected sex on nov.25, dec.1, dec.8, dec.9 & dec.10 my last period was November.20.2007 and my last period before that was October.10.2007 but my period is irregular

My money is on the cold.

Use protection, please. And wash your hands often.

i'm very nauseaus can't even smell food and my boobs tend to hurt at times but i also have a stuffy nose a low fever and a really bad migraine headache could i be pregnant?? or it's just a cold?? i mean me and my boyfriend had unprotected sex on nov.25, dec.1, dec.8, dec.9 & dec.10 my last period was november.20.2007 and my last period before that was october.10.2007 but my period is irregular
You could definitely be pregnant. You are asking for it by not using protection. I would test as soon as you can. Any indication of a change on the test in the indication window is a positive no matter how dark or light it is.

You could be pregnant because you are having unprotected sex. A lot of things can come from unprotected sex, of course, but you know that.

The symptoms you are describing are most likely a cold.

If your last period was on November 20th then you are not yet late for this coming period. Usually you won't have pregnant symptoms this early... usually the first pregnancy symptom is a missed period. Don't stress about being pregnant just yet. Wait and see if you miss your period before getting all worked up.
You most likely have a cold. But remember anytime you have sex (unprotected or protected) there is a chance of pregnancy. Best of luck!

Or you could be both, which is tough. But of couse you can be pregnant, any time during the month there is always a chance to become pregnant, some times during the month increase the odds. And you did appear to have sex during some higher times.
But I would guess that you are wanting to become pregnant, since you are having a lot of sex with no protection, so I would assume you want a baby, so looks good for it.