Help!!

Samantha • I`m a mom of 3. I love being a mom, my kids are my world. My hubby and I are looking to have another wonderful baby<3
My lmp was oct 1st - 5th. 
I am always regular and have never been more than 3 days late but now I am 9 days late! I was due for it the 28 th, I took a hpt on the 30th and went to Dr on the 4th for a blood test and both were negative. My Dr said if I don't get it in a week or so to call. I feel pregnant... Any chance I could actually be pregnant? I'm afraid to get excited but  as each day goes by and I don't get my period I get more excited. Should I test again? If so any ideas when?  Should I wait for another blood test?