False negative? Too early? Not pregnant?

Question

Has anyone used the clinical guard pregnancy tests from Amazon?  I bought them with an ovulation kit, 40 ovulation tests and 10 pregnancy tests.  What are your thoughts?
I have a 10 month old, still nursing, but not eats food and snacks through the day and only nurses maybe a handful of times thought out the day and night.  Last month was my first actual legit period since having him, like could see all the shedding (sorry tmi).  The hubby and I actively started trying.  My period was due today (I’m not sure if the cycle will be exact cause of nursing) but it didn’t come.  
I’ve been super tired lately, craving the craziest things and have been nauseous for days.  I took a clinical guard test yesterday and it was negative.
I read a lot of reviews that they were giving false negatives, so was curious for your thoughts. 
 
So thoughts on the clinical guard tests? Thoughts on pregnancy? When should I test again? What’s the best test to try?
Thanks!!!
Want to add that I know after only one period it could take time.  We got super blessed with our last babe and after being in birth control for 12 years, I one cycle and got pregnant right away, so I won’t be mad if it takes time, just frustrated and don’t know what to do. 
Prayers as well that this is the month please!

Answer

Sounds like you already know that breastfeeding directly impacts your cycle. So you could go months without another one even if you had one already. But ya never know! Clinical guard have always been decent for me. Not my favorite (order pregmate next time). 
False negative isn't really the correct term. If negative, its not usually due to a faulty test but rather one of these scenarios: 
1: you're not pregnant and the test is accurate 
2: you're testing too early,  and the egg hasn't implanted yet (if testing 12DPO or earlier)
3: you have your ovulation date wrong and aren't as far along as you think (see #2)
4: the egg has successfully implanted but there isn't enough HCG yet to be properly detected.
False negative implies there is something wrong with the test itself, which isn't overly common- but does happen. Best of luck mama!!!