Phobia about returning to work

Wondering if anyone has the same situation.. My boss after knowing about my pregnancy, did not reduce my work load but increase more. On top of my daily work, i was asked to manage 6 additional projects. There are days i have 6-7 meetings. The prolonged sitting and OT etc, weekend standby resulted in slight bleeding in Feb. Even after this incident, he did not relent. If i respond to slowly on a weekend if there is escalation, he pinged me on Saturday night. In Mar i had another bleeding cause weekend on standby, do OT until 8pm and many meetings. Finally doctor gave me one month HL. Next week i am going back, i am not sure if he is going to drill me again. I cant report him to MOM cause i have hit the salary threshold. Not sure what to do... #firstbaby