I feel crazy

I'm 33 with pregnancy #2. My son is 8 now, and was a total suprise when I got pregnant with him. This time I just knew I was and am thinking I found out way early (like 4-5 weeks). My doctor offered an appointment today with an ultrasound but I declined because I wanted to wait a couple weeks to ensure I'm far enough along to detect everything necessary at the first visit. I just want that "confirmation" that everything is normal and it's making me nuts.i So I've been thinking I will buy 14 pregnancy tests and test every day from now until my appointment. Anyone else worry like this?