Thanks for writing to us with your health concern.
The erratic spotting is because of the irregular intake of birth control pills.
What you do right now is finish the pack ( hopefully regularly ).
Stopping it out cold
will only worsen your spotting.
Then take a break for a month, using only condoms.
Once the break is over, start a fresh pack only if you intend to sincerely use the pills.
Else use another method.