Help and advice

So basically I had sex with this guy I had just met but we have the same friends and it was without a condom and I’m not on any birth control. It was 1 day before my fertile period and it says 7% chance of pregnancy. I didn’t end up taking the morning after pill I kind of forgot about it and didn’t have time to go and get it and I feel stupid for not getting it. I’m worried I could be pregnant but I’m on medication that means if I am pregnant it could cause a miscarriage or worse. I don’t want to go to the doctor because then my parents would find out and they’re really strict on guys and I’m really freaking out. Also I’m worried I could have an STD but he told me he didn’t have one, can I trust him? Any advice??