Could i be pregnant. Could be pregnant?

I want to know if i could be pregnant? on 12/04/17 the condom broke. On the 15/04/17 i took 4 escapelle (morning after pill) about 3 days after that i started having symptoms such as: nausea, dizzy, go to toilet more than usual, lower back pain, lower abdominal pain more like period cramps and sore breasts. Then on the 28/04/17 i saw light brown discharge and in the next day 29/04/17 i got my period. it lasted untill 04/05/17. My period is normally 7 days and the date changes sometimes, like for a couple of months i will start on the begining of a month and then all of a sudden at the end of a month. so today is 06 may 2017 and its been 2 days since my period stopped but i still feel the same back and abdominal pain as before, still nausea, my stomach feels like i ate a ton of food. and i feel even more tired than before. i have take a test but shows negative. i am 30 years of age. please help