I Had Sex 24 Days Ago, I Was Due For

I had sex 24 days ago, I was due for my period last Friday and it still hasn't come yet. I have a little bit of blood which is a light pink/brownish colour but it can be bright red, this started on Monday, it's only a small amount of blood that comes out when I wipe. I've also felt very bloated for the past few days and when I eat it makes me feel sick for a long period of time. Could I be pregnant?