Help!!

Jennifer • Hopelessly in love with my soulmate, mother of three beautiful kiddos: ❤️03/03/08, 💙05/06/10 and 👼💙09/28/18 - 06/02/2020

I just had my son 6 weeks ago and I got the okay to be intimate again at my 4 week postpartum checkup. My insurance had to approve the Mirena IUD and then it had to be ordered and still has yet to arrive. We have been intimate several times and I am exclusively breastfeeding/haven't had a period so I assumed we were pretty safe (yes we both know there is a slight chance). I was feeling a little off and decided to take a test that I had leftover from my last pregnancy. My urine was pretty dark (I know the test looks dried out but it's not) my question is, is this perhaps leftover HCG from my last pregnancy?? 🤞🤞