question

So DH and I have been TTC for 2 cycles. Last cycle had symptoms of pregnancy: nausea, cramps, crappie tastes, super smell you name it. Tested with BFN each time then AF came early well this cycle still kinda had symptoms but not like before then started getting some brown discharge when wiping then today I passed what looks like tissue that I would pass on my normal period but it was brown, only had slight cramping and some back pain then nothing Should I be worried?