feeling dizzy, lightheaded, slight headaches and unfocused

Hi,
Welcome to ehealthforum,
Few women can experience spotting before getting started on actual periods. Variation of +/- 5-10 days in your menstrual cycle length is considered to be normal as long as you have regular periods. Mild or occasional increase in pre-menstrual symptoms and dysmenorrhea is also considered to be normal. Wait and watch for your periods. Observe your current periods and next 2-3 menstrual cycles. If the symptoms remain persistent or keep increasing in intensity, visit your doctor/gynecologist for further evaluation and assistance. Treatment as needed (based on examination and investigations results) would be started to help you.
If you have been sexually active without protection, and if pregnancy is suspected as suggested by your symptoms (spotting, mild abdominal cramps, dizziness, lightheadedness, headaches, tingling & sore breasts), look out for development of any other new symptoms suggestive of pregnancy and consider visiting your gynecologist at the earliest for thorough examination (to confirm pregnancy related changes/signs in body) and blood/serum HCG level test (to confirm/rule out pregnancy accurately). Be in regular monitoring and follow-up with your treating doctor/gynecologist and report any new/abnormal symptoms immediately. Drink plenty of water. Take adequate rest. Maintain healthy diet and lifestyle.
Take care.