What is it?

Andrea

So I started my period 4 days early 5/22/18 finished my period on 5/29/18 my boyfriend and I had sex on 6/2/18 (no protection) and then on Tuesday 6/5/18 I went to the restroom and when I wiped there was a pink discharge.. just that one time and that was it. My boobs barely feel sore and I haven’t felt and kind of nausea. Anyone gone through the same thing or know if I could be pregnant or not?