9-10 dpo implantation dip?

Kayley

My temps been staying 98.4-99.3 after ovulation and suddenly today dropped to 97.4 or 97.6... that too low for implantation dip? Maybe just fixing to start?? So far my tests are bfn... but Im still in til 12 dpo right?? I didn’t get a positive with my daughter til 12-13 dpo... but I never tried charting bbt. I just started the last 2 cycles.