I just made a topic about my period is late and forgot to add information!!

I got my period October 29th till November 3rd,I found my period was odd,it was shorter and in the beginning very heavy and slowed down fast. This month I am late by 2 days and I've never been late. I'm very regular,and I'm on day 31 on my cycle which is weird.. I didn't notice but lately I have been eating more,I said to my friend as soon as I eats I basically hungry again like if I never ate! My belly button has been starting to hurt(don't now) I had it done for 2 years. I didn't have sex this month but last month on my fertile days(like twice or once) I heard you can still get a period. I am a little nauseous,I threw up the other day and having headaches now and the other day I did have a very bad migraine. I'm aware I can get pregnant me and my SO know that and we aren't preventing it either. Is it likely I am pregnant? I haven't gave much thought to it today but if I do start my period I will let everyone know :)