PLEASE help could I be pregnant or not? I'm unsure

hi everyone, I came off my pill around 7 months ago and since then my period have been irregular but my last period was exactly 4 weeks since my last one. my period was due a week ago tomorrow but still no sign and I thought I was back go having regular periods? although recently I have felt bloated, tired, drained, headaches, backache, sick and my other half thinks my boobs are a little bigger. I have done a few tests but they have done back negative. has anyone else been through this when coming off the pill or has anyone got any advise? thanks in advance!