how can My Level of Fertility be quantified?

1.My mensis is irregular, 28 days, 25 days, 31 days,26 days, etc. 28 days was more frequent;

2. i Was advice to take pill to normalize it;

3. After taking the pills for 2 months it worsen it;

4. my mensis began began to flow for the second time now, after 56 days;Quantified