Switching from low carb to low calorie a bad idea?

i have been eating low carb for probably 5 months now. i have lost about 30lbs so far. im sort of in a slump with it though. its not that i miss a lot of carby foods, but i miss being able to have options with food. ive found that im limited to what i will eat. i know there are a ton of low carb foods and recipes out there, but im picky so im bored with what i will eat. ive been debating going back to eating low calories. i weigh 155lbs now and im 5'2''. im at the lowest weight i ever have been and i feel a lot better, but my goal is 140lbs. i do also have a timeline. i would like to lose 1-2lbs a week and weigh 140lbs by august because my bf is coming home from deployment. i used to lose weight just fine eating low calorie but since ive had a baby, it doesnt come off as easy that way. low carb has really helped since then. my only worry is that since ive been low carbing, if i eat a few too many carbs one day, i will gain a lb the next day. so im scared of switching and gaining a bunch of weight again. how would i make the transition and still lose weight? also, how many calories should i even consume per day to lose 1-2lbs/week?