Need advice!

Hey ladies and gents! I’m new here and I already have a 10 month old little girl! So AF is 12/13 days late and I’ve been having a thin milky like discharge and I’m not sure what it is!! I didn’t get it with my daughter and I haven’t gotten my period and I’m super nervous. I took a couple tests last week and one came up invalid and the other came back negative. I’ve been feeling very exhausted and I just got sick!!! So ladies what do y’all think?! TIA!! ❤️🙂