I last had sex at the start of May(6 weeks ago) a few days later I got my 'period'. It only laster 2/3 days which is unusual since it usually is 5/6 days although I wouldn't say it was light(at least not the first day). This month my period is almost 2 weeks late and I have started to feel very bloated and feverish with a temperature. Nauseas these past few days. Slightly more tired than usual. Extreme hunger pains for hours regardless of what I eat. I am finished uni for summer so I am not stressed in any way...

I am on the pill
Was last months period implantation bleeding? Please help.