Cryptic Pregnancy termination

I’ve been away in Bali for work I’m a teacher. I just got back to the states and found out I’m pregnant. I’m measuring at 18 weeks. Thing is I had no idea I was pregnant no symptoms nothing. I have pcos so me not getting a period is not unusual and I did have 2 period while I was out there. My state allows termination up until 20 weeks would it be wrong for me to terminate??