Yet again another BFN!!!!

I have been trying for a year and 6 months to conceive my third child, I had a miscarriage a year and 6 months ago and it’s been impossible since to get pregnant😔😔 I done took different medication to help with the process along with tracking my ovulation with a digital kit and still nothing!! I’m 30 and my husband is 35 should I seek help with a doctor?? Just looking to see what others maybe able to help me..I’m seriously ready to give up.. me and my husband have a 4 year old together