TTC and nursing

Hi ladies. I am 31 and TTC baby #2. My first born is 18 months and still nurses a couple of times a day. My cycle has been back and fairly regular since 6 months PPD. My husband and I started TTC last month. Used CBDOT, had five fertile days and got my peak, BD'd every day last month and AF came today on Glows predicted day. I'm wondering if nursing can cause any issues with implantation etc. The strange thing I had very faint lines on four pregnancy test (first response) which makes me think chemical pregnancy. Just wanted some feedback. My first was a surprise and we were using pull out method. Thanks in advance.