could I be pregnant?

My due on date was 31st October, day after I took a pregnancy test and it was negative. On Wednesday 2nd I had some slight bleeding so I thought I was slowly coming on, it was light pink blood and never went dark. It lasted two days if that, and now there's nothing but white discharge which makes me feel like I'm bleeding but I'm not! My boobs are soooo sore and I'm really tired. When I eat food I feel sick straight after but haven't been sick physically. I'm thinking of getting a test but want to ask if it will be a waste of money? Do you think I could be pregnant or will I be coming on soon? Thanks