advice??

lala • Blessed with an amazing 1 year old son. Have been ttc#2 for 8 months
I have a 8 month old and ever since me and my man been pregnant we've told our doc that we want to start ttc 6 months postpartum we recently started this month and I've been taking ovulation tests since a couple days before the big O, (supposedly tmw) but it hasn't been getting any darker. Should I keep testing, or? The top was the first test 6 days ago and the bottom today.