I am 18 days late for my period now I should have had my period on the 13th of September I still haven't come on I am quite big myself but seem to put on a bit more weight I am so moddy so days and fine the next I have done a hcg pregnancy test and the results were negative but I am wondering why I am putting on more weight then usually can any answer my questions please ?

How long have you been putting weight on? How much extra weight have you put on and in what time frame?

If you were newly pregnant, the weight gain would likely not be much just yet. Some women do put a bit of weight on around the time of their periods as well.

Are your periods normally very regular? If so, you might want to see your gp about a blood test or wait and see what happens with your period for October; you may have just skipped September.