Pregnancy after Mirena removal

Hello all! So I’m super excited because my husband and I just found out we are expecting! My concern is the following...I had my IUD removed December 18th. We had sex on the 13th and now I have found out sperm can live inside of you for 7 days. I got a light but consistent bleed on December 19th-23rd but I’m not sure if that was my period. My Clear Blue Advanced Digital says I peaked January 7th. I tested on January 10th and the Clear Blue pregnancy year was negative. I had a small amount of blood when I went to the bathroom January 18th and tested positive for pregnancy yesterday. We are super excited but I can’t stop thinking of there could be any chance I could have gotten pregnant from having sex on December 13th. I just want to make sure little one is healthy and I’m concerned. My brain says I conceived after January 7th and that the 18th was implantation bleed but I thought I would ask for other opinions. Thank you in advance