Period really weird this month so confused. HELP PLEASE

My fertility window was open 14-17 and I started spotting on the 19th. Normally when I spot my period comes on the next day or two. I spotted for some days thought my period came wore a tampon and it didn't even fill up and it stop. I started back spotting I'm wearing a panty liner and it looks light brown/light red but when it dries up it look light brown it's not a lot I only change my panty liner once yesterday I woke up this morning and now the spotting is gone. I had sex almost everyday around the 3-18. Can you help I'm so confused can I maybe be pregnant? My period has never did this before.