What are my chances?

OK I STARTED YASMIN THE 20TH OF JANUARY ON A SUNDAY... I TOOK IT UNTIL THE 26TH OF JNAUARY AND HAD UNPROCTED THE NIGHT OF THE 26TH AND MY REGULAR TIME TO OVULATE WOULDVE BEEN THE 29TH... WELL I STOPPED MY PILLS BECAUSE THEY WERE MAKING ME SICK...AND THE 30TH I STARTED BLEEDING WICH I KNOW IS BECAUSE I STOPPED MY PILLS... BUT I BLED FROM THE 30TH TILL LIKE THE3 RD OF FEB...ITS THE 17TH OF FEB AND IM HAVING HEART BURN AND TINGLING IN MY AND SHARP PAINS IN MY STOMACH LIKE IM BOUT TO START BUT I DONT AND IVE BEEN REAL EMATIONAL LATELY... IS THERE STILL A POSSIBILTY I COCIVED ....MY NORMAL PERIOD WOULD HAVE BEEN THE 12TH OF FEB AND IT STILL ISNT HERE SHOULD I TAKE A TEST OR NOT WORRY BOUT IT??