I had my period last june 25 and it ended on june 29. and last july 9 until this day, i am having blood spots and experiencing some pre-menstrual syndrome like headache and diarrhea, and i'm just concerned if this is normal since?

Irregular vaginal bleeding between the periods is not uncommon but if the problem persists month after month then you may suffer from menorrhagia due to hormonal imbalance. For the different diagnosis, your sexual history is also important. You can neglect this month's event but you should see a GYN doctor if problem persists in the next couple cycles. Take care.