Am I pregnant or am I paranoid?

Y’all, I don’t know what to do. I think I might be preggers but I don’t want to start freaking out until I know for sure.

Here are the facts:

-Jan 13 was the start of my last period. Instead of my usual 4 days of light to medium bleeding, I had light bleeding for one day and then I spotted for a day.

-Jan 19 was the last time I had sex

-Jan 26 I started birth control. I know that birth control can mix up the periods and hormones and stuff.

- since Feb started, I’ve been so sick to my stomach. I’ve thrown up so much. I’ve been fortunate enough to never have had thrown up until the start of February. However, I can no longer long distances without getting sick, I get nauseated while sitting at my desk and the only thing that kind of helps is carbonated water.

- I have failed 3 at home pregnancy tests.

So what do you guys think? Am I paranoid or is there a possibility that I’m pregnant? When should I seek a blood test?