Hi. I'm A 20 Year Old Female Who Had Unprotected

Hi. I'm a 20 year old female who had unprotected sex on September 23 & took the Plan B on the 24th. About 5 days later I bled heavily for about 3 or 4 days. Again I had unprotected sex on October 7 and took Next Choice One Dose on the 8th. According to my period app, I was ovulating on October 4th.
1. I'm wondering if the bleeding I experienced with the Plan B One Step was normal or if it was implantation bleeding ?
2. What are the chances of me getting pregnant and does it matter if I used 2 different types of emergency contraceptives in a 2 week span?