Hi, If you have been sexually active ever since you had the miscarriage, you should indeed suspect another pregnancy. Since you have already had negative HPTs, I would suggest estimation of serum beta-hCG titres along with a trans-vaginal sonogram for a better idea. If pregnancy can thus be excluded, your symptoms could mean some temporary hormonal imbalance consequent to the abortion and should settle down naturally in a couple of months. Please take sufficient rest, good diet and avoid stress. Wish you good health.