So my boyfriend and I have been sexually active for about a month and my mom doesn't know and I was talking about sex with my bf and then I got in the shower and my sister read my messages with him and knows now and is threatening to tell my mom (and fyi my mom is very strict and religious) so my mom is going to very disappointed and my sister is forcing me to go to the clinic and get a pregnancy test and std test. I just need some advice please