Weight loss pills and TTC? Can it effect my cycle or chances of conceiving?

Im currently wanting to start planning/trying for baby #2. I’ve had 2 pregnancies- 1 successful and 1 miscarriage earlier this year. With my first baby I was very slim when I got pregnant and only gained maybe 30lbs. I bounced right back to my pre-pregnancy weight within a month which was 120lbs but then got on birth control. I gained over 50lbs on my IUD in a year so decided to have it removed 6 months ago and still have not lost even a pound of the weight despite dieting and exercise. Im now pushing close to 200lbs and really want to lose some weight before I get pregnant again. I got some Phentermine pills it says it’s an appetite suppressant and energy/metabolism booster and is supposed to help with weight loss but can weight loss pills effect my cycle or chances of conceiving in the next few months? I’ve been taking the pills for a couple weeks and now have not got a period this month. I was supposed to start 2 weeks ago and have had no signs of it coming which is unusual because I normally have a pretty regular cycle. Could it be the weight loss pills and should I stop taking them?

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