Looking for advice. TMI

Kirsty
My AF stopped 3 days ago. My periods last 4 days and that's it, it was a weird one no clots or anything (i usually get them) it did however last 4 days. 
Today I had sporting (I never do), my cervix is very high and super soft (unusual considering AF stopped 3 days ago) also been feeling super nausea for a few days mostly at night time. and breasts are tender. 
What is up with my body??