Help!!!

Hamna

I've been ttc ing for 4 months now. I've 2 years old daughter. We got preg with my first child right away but this time it's so frustrating. I started to track my ovulation this month. I've 29/30 day cycle.We started BD at cd 13 but I didn't got a positive OPK.Do you guys think I missed my fertile window this time??Or should I visit doctor to get my chekup done??I'm being so stressed that I'm getting chills....😢