What Causes Spotting With No Regular Period Along With Stomach Pain?

Hello doctor i am swapna 22yrs old, i had unprotected sex with my hubby on 23rd of march, now im missing period the actual date is 9th. On 9th also had same like 23rd.Then i got small bleeding of 5 or 6 drops for 4 to 5 days with pain at my lower stomuch what could be the reason for that?Do you think im pregnant but now i want to go for abortion because i want to continue my studies. Is it possible to have safe abortion at home because i cant afford to consult the doctor. What could be the procedure for safe abortion at home. Please help out of this. Thank you..