Period Ended...Had an unsafe intercourse right away

i just ended my period and we had an unsafe intercourse with my partner i am also a ttc # 2 for almost two average cycle is 30 days then suddenly changed to 40 and this month changed to 32 days is it possible to get pregnant for having an unsafe sex right after my period the other day?? and today i found out i had a brown and a very small amount of red spot on my liner.