condom slipped off but he did not cum

Ok me and my fwb were doing the do, per usual but anyways we went two rounds. We used a condom both times of course. During the second time  the condom slipped off but he did not cum at all because round two and stamina was at max level. This was last night and my period shouldve/should start/started today.
Should I be really worried? I am out of my fertile window by like a week and should start so 98% sure im in the clear.
Keep in mind I have been extra stressed lately so i maybe late in general due to that. Thoughts? Because the stupid morning after pill is like 40$ which is ridiculous. anyways. Yeah. Im in college.

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