2 day AF??

Char • Mother to one beautiful Son😍
Ladies, your comments and opinions are appreciated! Thanks
Has anyone experienced a two day period before? I thought for sure we nailed it and was pregnant. Then experienced brown spitting Thursday. Friday heavy flow, Saturday normal flow and today all gone. Not a drop all night and this morning. My cycle is very regular 26 days with AF hanging around for 4 days. 
Anyone ever had this and what was it associated with?