If your last period was sept.29 had sex oct.4th,oct 15th and last date was oct .22nd all unprotected prego tests says positive. how far long is she?

Oct 15th-probable: As described by the dates you have given, you most likely ovulated on or around the 15th, so that is when you would have been impregnated. Best wishes.

4 weeks, 5 days: If she has regular 28 day cycles, then she is 4 weeks and 5 days. We count from the first day of her period. Conception occurs about 2 weeks later, which would be October 13. Since you had sex on the 15th, she may have ovulated a little late, but the egg may have survived long enough to be fertilized.