Af 2 days late, 4th letrozole cycle

Af is two days late and I haven’t felt any symptoms so I’m like “ok whatever it will be here by tomorrow” but still nothing. For the past 3 cycles I’ve been on letrozole and doing cycle monitoring. For all 3 cycles before this, af arrived 15 days after testing positive for the surge, but not this cycle. I also ovulated earlier (CD 15 instead of 22) this cycle as I was moved up to 7.5mg. They told me to come back in two weeks for a hcg blood test, but I don’t want to get my hopes up so I took a hpt and it was negative. Should I bother to go in for a blood test or just wait it out?