A little sad

Just had a baby 4 months ago 6/22 now we’re tryna knock out for a boy.. I should be extremely fertile rn but idk what’s going on! My “period” this month came early I spotted for nearly a day before it actually came took 3 test while waiting (got no’s) but I feel pregnant . Crying all over the place , eating everything , sleepy and all! I’m so confused I guess this my period and not implantation but hey I guess I should keep trying ?? .. I don’t understand tho sex on ovulation days and all! What did I do wrong