How to not stress???

Alexis
I'm new at this but I wanted to give it a go. 
It's been almost 2 years since I miscarried.. My partner and I have been TTC for 7 months now and it seems like my period is coming later and later every month that I get my hopes up and take a pregnancy test and always get a BFN
I've read so much about what can be causing this and the one thing that always pops up is "don't stress" .. But my question is how ? 
Does anybody have some advice ?? I don't really know how not to stress. Or if I'm even feelin "stressed".
Also any women that have recieved a BFP any tips or tricks that you feel helped you get pregnant ? 
Greatly appreciate it guys ❤️❤️xoxo