Ladies please help !!!

G🌈

Opk was peak (using clearblue advance) on 4/4 i marked as ovulation day 4/5 today 18 dpo and got a negative frer pregnancy test.. bbt for the last 4 days went up to the 98°F. Any ideas ? I had a d/c in january and got my period back at 6 weeks 4 days of procedure thats a total og 46 days. Im on cd44.. any ideas if im testing too early ?

Also i had a lot of watery milky cm still watery now

Also backache and headache

Thank you in advance