So frustrated!!

So I've now missed my second period in a row, and I'm still getting BFNs. Unfortunately, I am crazy about taking pregnancy tests since my husband and I have been trying to conceive our #2 for about six months, and I haven't missed a period since then (when I took out my Mirena). Could the stress be why I'm not getting my period? Or could I be pregnant and getting false negatives on the tests? I've had mild pregnancy symptoms but idk if I'm just reading to far into things or what..I'm so frustrated and confused. Help please!