Need some advice

Brittney • im 30 a mom of 2 beautiful princesses one who is 4 years old name jayme and another that is 4 months old named Delilah and have the best bf ever named enrique
Okay I'm 28 and my period was due June 27 but I didn't arrive. I've taken 2 pregnancy test and came back negative. To day I went to the restroom and wiped and had some implantation bleeding... I haven't been under any stress lately. Is it possible I test to soon?? I took one 10 day after missed period and another 14 days after missed period but both were negative. Should I test again??