Hey Am Maria Am 22years Well I Always Start My

Hey am Maria am 22years well i always start my period on the last of the month but i had sex with my boyfriend and like 3days after i had light blood come out for like 2days then it goes away but now i fell like if am on my days i have been on for 2days but its not heavy its light flow but its a light red or pink color i have been felling like i get morning sickness but i cant throw up what is wrong with me?