Pregnant?

Shaun
I had sex 2.5 weeks ago. Was suppose to get my period Monday. Got it. Bled for one day and haven't since Monday night. With my other two kids I didn't bleed at all and didn't find out until around 5/6 weeks..just wondering if it's way too early to tell and I'm freaking myself out or if I should buy a test and go from there. Thank you.