Pill and sex and creampies

So I've been on the pill for a month. And today me and my boyfriend had sex for the first time without a condom (not our first time having sex). He ejaculated inside me 3 times. Should I have anything to be worried about? (I know I'm at risk of STDS) I'm a worrying person, what are the chances of me getting pregnant? Does anyone have any info and just anything that can rest my troubling mind? Much appreciated. (Follow up question: does anyone else let their parter ejaculate inside them? (For fun, not baby making)
*SIDE NOTE POSSIBLY IMPORTANT* and this morning I took my pill 4 hours late- does that effect me in any way? (Update: my pill leaflet says that if I miss my pill for more than 12 hours that's when to worry and follow certain instructions. But if it's under 12 hours I'm still protected). Thank for the help!