Just give a cheap pregnancy test a try, they work just the same. If it comes negative, wait about a week and take another, and if it's negative go to the doctor if you're still worried because then you save your money going to the doctor
Is it still to early for that or should I wait. I know with home pregnancy tests you need to wait because of the hcg levels but I don't know about blood.
You could be or its your new birth control. I can't take birth control when I was on it it made me sick I had bad headaches and I felt off and not me at all. It takes 3 months to get use to birth control. Your dr should have done a blood test or pee test to see if you where pregnant before giving birth control. Maybe call your dr and see if you can get a blood test done.