Yes, absolutely. Irregular periods make it harder to predict when you ovulate, but you still ovulate. Using a calculator combined with ovulation strips can help you time intercourse correctly.
For women with regular cycles, they are about 80-90% accurate in predicting the fertile window. However, they rely on averages. Stress, illness, or travel can delay ovulation.
Yes, especially if you have a short cycle (e.g., 21 days). Sperm can survive for 5 days inside the body, so early ovulation can overlap with post-period intercourse.
This is the 6-day period each month when pregnancy is possible. It includes the 5 days before ovulation and the day of ovulation itself.