I dont know wat to think....?

its 4 mnths since my miscarriage and my husband and i are sio ready for that lito person in the house. i had my menses last week. but i feel pregnant. could i? i get so tired easily and nauseus.... now how about the saying that if a couple is thinking too much of starting a family, it doesnt happen but wen ur minds are off it... is it tru and cud i be pregnant?