What are the chances I could get pregnant? Please comment!

Me and my husband only use condoms as birth control (& the tracking in this app) and we are careful around my ovulation. I was on the pill for several years and went off of it about a year ago because I didn't want to take hormones anymore. My cycle is very regular lasting between 25-27 days, period lasts about 5 days, usually ovulate on day 12-15. Today is day 9 in my cycle. Here comes the TMI section. Today we had sex with a condom and after he came he still was penetrating me and going in and out some because it felt good for me. The condom was pretty slippery because I was very turned on and because he came. I was on top and when I got off the condom came off with me, the end of it was barely hanging out and I was able to pull it out but I'm still very nervous about the possibility that sperm got inside of me either from that or from him continuing to penetrate me with the condom so slippery, especially since sperm can live for several days inside of me. We do NOT want children but I am not willing to take Plan B (personal preference, please respect). What are the chances that I could get pregnant from this??