It may be due to early implantation
bleeding/sign of abortion
or uterine cause.Do a blood test
for B-hcg to confirm conceptional product.
If negative,then need not to be worried. 2-3 days date alteration is nothing significant and it may be due to hormonal imbalance/stress/psychological upset/irregular eating etc.
If positive,do a USG lower abdomen to rule out gestational sac/viability of fetus.Consult with your doctor and take suggestive measures.
Take Tab DROTIN DS for abdominal cramp
,avoid stress,take healthy diet and maintain genital hygiene properly.