opinions!? (trigger warning)

Alright so I'm a FTM I have a 7 month old little girl I haven't had my period since my pregnancy and I've never been for birth control. so lately I've been feeling off nauseated tired white creamy discharge gaining a little weight my breast do get sore here and there but I also EBF and I've been getting cramps around my waist line and my lower back has been hurting here and there I've been feeling light headed/dizzy and been having more headaches/migraines lately i heard BF can still make your hormones go crazy. i took 2 pregnancy test they both came back negative but I feel like maybe it's to early to tell or maybe something was wrong with the tests or I'm just going a little crazy. should I wait a month to take another test or just forget the thought of it what does everyone else think?