You need to see your doctor if you are having headaches and pain.
I still have stomach pain and bad headaches. My boobs are starting to hurt. Also my test are negative but is it normal for me to have pain from march until now
Sounds to me like the bleeding in February was your period - it was just 'off'. The fact it was later and then lighter than normal would indicate you perhaps ovulated later, or your hormones were just off this month.
Sudden weight gain can also cause your cycles to change.
You didn't have a miscarriage - you'd know if you did as bleeding would be heavy and painful.
Sometimes our cycles just change for no reason. Try eating better and exercising more and see if that makes a different.
When did you go to the doctor? And have you taken a test?