when to take the test?

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hi everyone! i’m currently exclusively breastfeeding & 4 months PP on the 5th, recently i have been having all of my pregnancy symptoms again. like fatigue, cramping (a lot), dizzy, headaches, nauseous, constipation, metallic taste in my mouth & even a yeast infection (one of my very first signs of pregnancy with last baby) i got my “period” around 6 weeks postpartum after bleeding for the regular amount of time after giving birth..since then i haven’t had one since. i had sex for the first time on my 3 month PP date (5 Dec); he finished inside me & we don’t use BC so my only thought is pregnancy. yes i did go buy the test & it came up negative.. i used a digital one just to be sure. My question is... how in the hell do i know when to test if i don’t have my period bc i am EBF?! super confused. I don’t know when is too early lol. If someone has answers, please help!