Sex and pregnancy ?

I had sex yesterday for the first time since we found out I was pregnant I’m currently 14 weeks my obgyn never told me where my placenta was or what type of placenta I have, my last ultrasound was at 9 weeks so curious if I had placenta previa or a low lying placenta would I have bled after I had sex with my boyfriend? I just want to no if it’s safe to continue or if I should wait till my 20 weeks scan to do it again