Late and frustrated

I’m a little concerned. I am 13

Days late and my cycle before this was regular for over 1.5years.

I keep getting negative tests.

I even went on Tuesday for a blood test and that was negative also. I see my doctor Wednesday, should I be asking for certain tests or anything? I honestly don’t think I’m pregnant according to glow I should have ovulated June 11 and it’s been over 3 weeks since I’ve had sex so I assume the blood test would have picked it up I have pcos so my ovulation day may be off. I don’t have any added stress, I was going to request an internal ultrasound to check my pcos (it was a lot better than previous years). My cycles are always between 35-38 days, in 2 years it’s been a few days late and no more.