Help I’m terrified

Im 19 and I’m 5 days late with my cycle. Last month was the first month without birth control and my period lasted 14 days, so I’m hoping this is just my body trying to get back into a normal-ish cycle? However, I had sex last month but we used condoms and withdrawal (which I’m told is effective against pregnancy if used together). But I’m not sure. Every time I have sex I’m always scared I’m pregnant afterwards and I look for symptoms like the cravings, enlarged stomach even tho that’s impossible at three weeks, nipple weirdness and cravings. I want to have sex with my partner and be confident about my decision without feeling paranoid all the time, and birth control really messes with my body and I really don’t like it. Should I stop having sex all together? I’m not sure if I need some reassurance that I’m not pregnant or I just need some advice. I don’t know what to do.