Sex for 2nd time

Hi, this is weird for me to do or write about but I'm a newbie at this whole sex thing and need advise or guidance. So my boyfriend and I had sex last night and night before for the first time. I didn't bleed and realized he didn't where a condom....last night or the night before. I'm worried that I might be having weird side effects. Really blotted and gassy. Is this a sign.....