Hello doctor, me n my boyfriend had unprotected...

Hello doctor, me n my boyfriend had unprotected sex on 5th of april and i supposed have period on 10 to 12th of april but in the while i suddenly have to travel on 7th of april. And when i didn't get period on the date i mentioned u thn i took a prenancy test to check if im pregnant on 16th april bt it came out negative but still no period and then i came frm travel on 21st april bt from monday i didn't feel like to eat. I had diarrhoea n felt like vomiting didn't vomit for 2days and thn i check again last saturday early morning and again came out negative. From yesterday 29th of april i start to have period bt middle of the night i had pain in my stomach very badly. Couldn't bare at all for 1hr and somehow i fell asleep. And in the morning whn i went to bathroom for the pee i saw a big blood mass and on that mass somewhere it was off white color and it never happened to me and today is the 2nd day of period bt im not bleeding like other days of my period. Do u think im pregnant and the period is the sign of prenancy? Pls tell me im.very confused. My mum said may i had miscarriage bt how come whn i checked it came 2times negative.