When to test ??

So I track my period on 3 different apps. On Monday night to Tuesday I was having brown discharge which turned to pink then brown again and then gone by mid Tuesday ( implantation bleeding) Since then I’ve been having an increased amount of cloudy stretchy CM. I was supposed to start my period Thursday but nothing . Definitely having symptoms: severe nausea, cold like symptoms, cravings, my lower stomach feels really full , lower back pain, my legs are going numb when I sit too long . I don’t remember having these symptoms with my son because I found out when I was 3 months and fully on birth control. Haven’t used birth control for 2+ years . When would be a good time to test??? I took one today and nothing. I also remember when I tested with my son how faint it was and I was well into pregnancy.