My last period was between 10 to 16 of September. Today is 16th of October and I haven't had my period. I do have sex last two week, with condom and take morning after pill for extra contraception. I have some pms symptoms for the past few days but it like on and off. Need help over here.

More than likely your period will still show up. The morning after pill can sometimes cause it to be off from your norm.

Give it another week or so, if still a no show, try a pregnancy test following the directions exactly.

So, in the mean time, what I should do ? Beside that, I also don't have the pregnancy symptom such as breast sore, extra vagina discharge, etc. I just feel normal.

It would be wise to treat yourself as though you might be pregnant. This means taking a multivitamin with at least 400 mcg of folic acid (all young women should be making sure they have at least this much folic acid from a vitamin if not their diet). Being smart about what you put into your body. Everyone knows what things are good for them and what aren't.

Since you are having sex, the possibility of becoming pregnant will always be a factor.
However, odds are quite small that you are, due to the condom and the morning after pill.

Sigh, I don't want to be pregnant as I am still going to college. Guess I just have to wait and see what happened to myself

Beside that, is there any pre-pregnant symptom I will have ? I try Google out but none of it matches

If you are using a condom and the MAP its unlikely you are pregnant.