I last saw my period on the 3rd of this month January it last for 4 days…

I last saw my period on the 3rd of this month January it last for 4 days and I had sex with my partner on the 11day of my cycle 3days to ovulation and i used the ovulation strip to run some test on the 12day it was positive on the ovulation strip pls and have been having sore breast, light cramps, backaches and headache pls is it possible that am pregnant