I had sex March 18th ( no condom ) my period was due in 3 days I didn't get it but I was spotting a very light pink color.. I know its early but could I be pregnant.

Any time you have sex pregnancy is a possibility. You are now plaing the waiting game and have to wait to see if your next period comes as expected.

Like you said, it's too early to know for sure but you could be.

While it is not ideal timing, 3 days before period is due. As the others have noted, anytime you have sex, pregnancy is of course a possibility. But there are also other issues like stress and emotions that can effect the cycle.

Now, like many other women, you have to just wait. Because of the timing, you may need to wait till next month and see if you get that period or not.