Protected sex 6/19, period 4 days late, not constant flow- small blood amount in spurts, blood clots. is this my period or spotting? cud i b pregnant?

Maybe a period, but: A urine pregnancy test, done correctly, gives a reliable result 3 weeks after sex (3 weeks after when conception might have occurred), 1 week after missing a period, or 1 week after starting a "weird" period. If done sooner, a positive result is likely real, but a negative result may be due to testing too soon, and thus lead to a repeat test. Tests are inexpensive and sold in stores everywhere.