spotting need your thoughts

Im a breastfeeding mom i had my first period in feb 4 and ended feb 10 .. we had unprotected sex with my husband 3 times but we use withdrawal method i think its only once he didn't pull out and yesterday we had sex after an couple of hours i had to go cr and i had notice brownish nor red discharge feels like blood am i pregnant in it? I havent take pt im afraid in may come up pregnant.?