Questions - so nervous UPDATE!

Lynn
Just found out I'm pregnant after 1.5 years of trying and my third round of letrozole.
I found out at 10/11dpo and had my first beta draw today at 13/14 dpo. I'll be 4 weeks tomorrow. Number was 148. Nurse said it was good.
Also - my doctor doesn't want to see me again until next Wednesday (I should be exactly 5 weeks). He will draw more blood and do an ultrasound.
I've being POAS like a mad woman and the line has been getting slightly darker and I had a positive digital today.
My resting heart is also at 84 today. My normal (not pregnant) rhr is 68.
I've been having cramps and spotting and a touch of nausea today. No other symptoms. Honestly if I didn't get a positive test I would think my period is coming.
I haven't told my hubby yet though. I'm so so scared to lose this baby (we've had a cp and a missed miscarriage before). I want to be excited and happy but I'm having a hard time.
Couple of questions:
What do you think of my hcg number? Should it be higher?
Do you think waiting 8 days to draw blood is odd?
When did you tell your significant other??
Here is the frer from today (13/14dpo). SMU, 2 hr hold.