Period was 3 days late then on the 4-5 day it came on heavy 6 day very light 7 day pinkish only when wipe. can i be pregnant?

Unlikely, but...: A urine pregnancy test, done correctly, gives a reliable result 3 weeks after sex (3 weeks after when conception might have occurred), or after starting a "weird" period at the time when her normal period should come. 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.