Hello obioguchi chizoba
Welcome to health care magic forum
If you are fully breast feeding your baby chances of pregnancy
are quite less .As withdrawal method has its failure rates because penile secretion before ejaculation also contain considerable number of sperm.As 5th April is around your ovulation period.So it is suggested to wait & watch for your periods ,if you don`t have period in time get urine for pregnancy test done after 10-15 days. as for i think your abdominal pain
is not due to pregnancy.
Wish you good health