Me And My Husband Are Trying To Have A Baby,

me and my husband are trying to have a baby, I've been off birth control for seven months and after the last time we tried, I got cramping and nausea. it went from that to headaches, sore breasts, my nipples are slightly darker, I feel bloated, cooking meat makes me sick to my stomach, ive been extremely moody, I took three pregnancy tests a week ago and all three came out with an almost invisible positive sign, but I took one this morning and it came out negative, but I have all the symtoms, I never feel this way with a period, ive never actually felt this way at all.