need to loose weight.....

April 2017 I weighted 160ish and I'm 5 foot 4 inches tall... i had my 1st pregnancy and miscarriage may 2017... fast forward to now and last night I was 172... what are some ways I can loose the weight I have gained... I love to walkout with our busy work life it's kind of difficult... and summer is almost over in michigan...I feel like after my Mc i let things go and I have never gained this much weight so fast... normally I main tain it....also on Zoloft to help with depression..