Advice?

So the last I had sex was the 16th/17th of September, I had a very heavy period in October, which I don’t usually suffer with a heavy flow, and usually lasts for 3 days, this one lasted a little longer, i was also experiencing painful cramping which again I don’t usually suffer with, apart from the off cramps, nothing I can’t deal with. November I’ve had no period, no sore nipples (I usually get before my period) I constantly feel sick, every day! I don’t think it’a pregnancy as I’ve had a “period” had anyone else had this?