Help please!

Hi all I had sex today with a fwb, she’s not on birth control but we used a condom

I noticed after the fact that there was (potentially) some cum that leaked out of the base after I came while she was on top condom did not break, I didn’t pull out immediately after I came however I noticed the reservoir still had my cum there, when I went to tie the condom I noticed a bubbly white substance on the inside of the condom where I tied the condom and I’m worried that some of it may have leaked out the base when I had cum! I was also extremely wet at the base of my cock.

What I’m worried about is after coming the cum leaked out the base of the condom and potentially mixed in when she kept going when I came

Should I ask her to take the ECP? or am I over thinking it and I should be ok

She’s on day 17/19 and will have her period in 9-11 days how likely is it she might be pregnant, am I thinking too much about it?