Cramping...4 days after having sex during my ovulation period...is this a sign that im pregnant?

Ok, so me and my husband did the deed on monday june 20th, i knew that i was ovulating cause i checked all the ovulation calculators and found that this week i was ovulating, i did what all the books said like lay still after he has done his thing and everything, but i felt really weird after wards, i had the same feeling i did the day i concieved my son, then yesturday and today alittle bit, ive been having slight cramping. Obviously i know its too early to test, but my question is when can i test and could this be a sign im pregnant? HELP!!! *FYI im not familiar with all the lingo on here so please spell it out, dont abbreviate, thanks*