Preseed, temping, cm & cervix, Amazon

Megan • Megan💄 Ortho asst🦷 fur mom to two GSDs🐶 3 miscarriages 👼🏼 Gracie Mae🌺
I have heard pros and cons about preseed! I would like to hear some success stories about it. I would purchase the one from Walmart! Some info on that would be great! 
Temping, honestly drives me crazy. That is all. 
Cm and cervix checking is something I've never done before. I know little nothing about it. 
Also, I plan on getting bulk OPK and HPT off amazon. I do believe their called "wondfo." 
Any tips and tricks yall have as to getting pregnant would be amazing. Also any info yall have on these subjects are more than welcomed. 
Thanks ladies! Baby dust to each and everyone of you! ??✨