Spotting at 5 weeks/4days

Morgan
Starting Wednesday after using the restroom I wiped and saw light pink. My husband and I went to the ER where they checked my hcg which was at 451. They also did a transvagianl U/S bit did not see anything since I'm so early on on my pregnancy. The spotting stopped but I was told to come Friday so they could watch my HCG levels. Friday I went in and my levels increases to 789. Well last night the spotting returned but turned red so again we went to the ER. My hcg levels rose again to 1123 which they said was great and that the spotting could be implantation. My ? Is had anyone experienced something similar? Is this type of spotting normal? I had a miscarriage back in 2015 and this is our rainbow baby. I'm really nervous!!!