Could Heavy Bleeding 7 Days Before My Expected Period Be Implantation Bleeding If I Have 40-day Cycles And Am Trying To Conceive?

I m 31 years old and I ve been trying to conceive for the past 4 months. For the past six months I ve been tracking my period, and it s every 40 days. I ve been heavily bleeding for the past two days, is it possible that this may be implantation bleeding? My period isn t due until the next 7 days.