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As your left tube has already been removed due to ectopic pregnancy
,there is chance of pregnancy only when ovulation occurs from right ovary. As you have undergone ovarian drilling I would suggest you to undergo test for FSH and AMH to know the store of eggs in your ovary. You may need ovulation induction
, follicular monitoring and then IUI ( if ovulation is occurring from favorable side) to increase your chances. If you are not responding even with maximum dose of clomiphene then you may require gonadotropin
injections followed by IUI. You can try 3-6 cycles of IUI and if there is no success then you should think of IVF treatment. Take care.