Help!

Hello!! Im realy new at sex so i have a lot of stupid questions. So. My period is suposed to be tomorow. I had sex with my bf 2 days ago. It was protected sex (condom), but it sliped when i was getting of him (i was on top) he didnt cummed inside me. So... should i be worried or im safe? Im feeling all the period simptoms :) thaaanks!!!!