Am I pregz or what?

So my “period” came on Thursday (31st) & was extremely light. Not even considered spotting & it was the same thing on Friday (1st) Well Saturday (I had sex) and the flow came after we had sex... (or so I thought) nothing else came after us having sex. Same thing on Sunday nothing & on Monday I had sex (blood came again) but after that nothing again... What is going on ? & This is the normal time of when my period should come on. I dont ever have periods this light!!