According to the ovulation calculators I had unprotected sex with my boyfriend on a fertile day. Now I have cramping, fatigue, breast sworeness, zits on my face, headaches, back aches,craving salty foods, and I'm moody. I'm not suppose to start my period for another 5 days and I've never had pre period symptoms like this before so could I be pregnant?

Of course, but there's no way to know until you do a test.

Sex equals baby, so yes of course you could be.

Were you tracking with body temp or where you using those silly online or phone estimates for your fertile time. If not actually doing tests or tracking temp, you have no idea if you were fertile then.

But you have to wait, till about 10 days after the period is due, then test using first urine of the morning