Hello, doctor i am 25 yrs old i have two daughters one is 4yrs

& oter is 6months after the second baby i had periods after 4months from her birth that is on 27 march after that period i didn't have periods. I had registrone tablet for three days to induce my periods but nothing is found ihad the prega test also after one month&seven days it was negative so tell me plz what to do?