I started my period or what I thought was my period on 5/12 on 5/16 I have intercourse, and it stopped and hasn't restarted, could I have gotten pg

Well I heard that if you have sex while on your period, it shortens your period so that could be the case...But if you are worried that you could be, I would make a trip to the doctors to be sure of everything!! Good Luck and keep us posted!!

Yes I have heard of intercourse shortening the length of your period also.

But how long are your cycles? Do they last 4 days or 7,.

I'm guessing you didn't use any type of Birth Control. I think if you have sex closer to the end of your period. You have a high chance of getting pregnant. Because that's when we ovulate.

Wait a few weeks to start taking tests. It'll just be a waste of money if you take them too soon. In the meantime no drinking just in case you are pregnant. You can also start looking for other signs. Like breast tenderness, nausea, mood swings.
Hope that helps
Let us know how you're doing.
Take care

It would not happen that quick - you don't generally start seeing signs until you are at least 1month pregnant - any concerns however then you should go and see your local GP - they will be able to help you!