Overreacting or just paranoid?

Vonnie β€’ In a healthy relationship with boyfriend ^_^
My period starts in 3days but I'm starting to feel early symptoms of pregnancy. My breast are sore, I feel dizzy a little, urinate frequently.... The last time me and my boyfriend had sex was about almost 3weeks ago I believe. Should I be worried or am I just really paranoid πŸ˜”πŸ˜”πŸ˜”?