hello dear,i am 34 yrs old,hard sex with my hasband on the 17th and i have been having cramps since then,on the 30 i hard drops of what i took to be my period,then a normal flow the next day,and next 2 days i hard a few drops.but i still have the cramps ,lower back pain some light abdominal pain and a light headache ,i am warried,what does this mean?