3 months pp and....

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I am 3 months pp havent had a period yet and am breastfeeding 2 bottles a day are supplemented with formula but i nurse often and pump. On july 25 i had risky sex with my husband no condom july 26 a lottt of cm watery on july 27 crampy july 28 massive headache for 2 hours and july 29 one time light pink spotting. I didnt even try to see if i was ovulating bc i was on vacation but those are consistent with symptoms of ovulation that i uses to get. Is it possible? Would there be a chance im pregnant? Does anyone have any similar situations? Didnt think i was even fertile again only 3 months pp and havent had a period yet...