preggo or not

Melanin

so I took an emergency pill after 3 days unprotected sex with my boyfriend. After a few days I started feeling nauseous and did a pregnancy test which was a negative and currently my period is 6 days late. I dont know if I am pregnant or not because my boobs are very heavy n sore and I keep getting these cramps like my period is about to start. I have been getting them for about 6 days now. pls help