Disappointed, unsure what wrong

I’m going to be 28 in a few months my husband is 32 TTC for 9 months been tracking my cycle and ovulation for 9 months have sex almost every day or every other day and sometimes 2 a day.. my son will be turning 9 (not my husband child) I wanna give my husband at least one baby.. start to feel depressed but he says he will still love me if we can’t have a baby... but I know it’s all he wants is to expand our family. Give my son a sibling. I’m starting to worry something wrong with me... I’ve been taking Conception pills... every month I take a pregnancy test but negative. Starting to give up.... I thought for sure this month would be our month, I’ve been Nauseated, and even threw up a couple times, i’ve been tired, but then today there is been brown spotting, And I had a light cramping on the 24th... my . It’s supposed to be in seven days. 

Any advice? Or encouragement?