i got questions!

1 i am currently ttc baby #2. #1 took 7 years ( she is now 16 months old) i am on CD 21 but I have long periods like 30 -33 day cycles. any ways I just entered my t ww window and had a light bit of blood. light a dot. literally. am I looking too hard for positive signs? #2 what is and how does a diva cup work? I am so curious about this. like tampons don't stay in for me I get bigger , smaller, don't matter. plus tampons are so uncomfortable for me. any and all in put is wrlcome. thank you