ya girls a lil confused 🤦🏽‍♀️

Alright so basically my last period started on the 7th of January, ending on the 12th. According to the calendar on this app I was on one of my highest percentage days of conception when I ended up having unprotected sex. Approximately 6 days later I noticed I was lightly spotting what you would call light pink/brown discharge which ended up lasting approximately 2/3 days tops but within that time I was experiencing light cramps and since then iv been experiencing many headaches. Now today iv noticed a tiny bit of brown discharge which iv never really had before and again according to this app my period isn’t due for another 4 days so I’m a little confused on what’s going on but have any of you babes experienced anything similar to this or have some advice on what the hell is going on? 💁🏽‍♀️🖤