Help me understand...

Okay so had my period start on the 9th of April. I usually have a 32 to 35 day cycle. Usually ovulate around day 21. We had sex on the 15th April. I then had spotting on the 23rd and 24th and strings of blood through snotty cervical on the 26th which would be cycle day 17. Would the spotting and blood be from ovulation? Why would i be spotting on cycle day 14 and why would it last for 3 days? Would this be ovulation bleeding? Could it be implantation bleeding?