You are currently suffering from irregular period and hormonal
So need to investigate properly to rule out pathology. Do Blood for FSH/LH, Prolactin
You have to regularize period with medicine.
is possible only if ovulation and sexual intercourse occur in correct timing.
Do sex in missionary position. No use of contraception
Also avoid stress,tension and anxiety.Do light exercise.
Take healthy diet and sleep well.
All the best.
For more detailed suggestion,mail me.....firstname.lastname@example.org