My boobs hurts I feel so tired the pass two days I barely eat anything I use the bathroom A LOT!

Hii My period came the 12 of this month it finish the 16 and I had sex the 18 (with a condom) and the 21(without). My boobs hurts I feel so tired the pass two days I barely eat anything I use the bathroom A LOT! I just want to know if there is ANY way I can be pregnant??