HELP.

So my period has been lighter than usual. Normally I cramp really bad when it first starts, even throw up and my period is VERY heavy the first 1-2 days. This time I had the routine cramps and nausea, but a very medium to light period the whole 4 days. When me and my boyfriend have sex he uses the ejection method, which he’s pretty good at. But I’m kinda nervous about this light period. Could I just be tripping or is it a sign of pregnancy??