Hello my first day of my last period was Dec 15th 2014 I took a pregnancy test yesterday it was positive 2 to 3 weeks. My cycles are usually 35 days and 13 to 14 for ovulating. I had unprotected sex Dec 26th with someone other than my significant other is there any chance it could be the "one night stands" child? My significant other and I have intercourse daily and don't use protection.