I've had acne since I was 12, so for 26 years... Clindamycin, a topical preparation, is perfectly fine during TTC and pregnancy. Most tropicals, but not retinoids, are OK. There are also some oral meds that can be considered although ideally you'd want to stay away from those as much as possible. I am currently on retin-a, clindamycin, oral amoxicillin and spironolactone and expect we'll be TTC #2 in 2-3 months. I'll be going off both oral meds and retin-a as soon as there's been a chance of conception, but in fact some derms and OBs are fine with keeping patients on certain antibiotics until pregnancy is confirmed. There is a LOT of misinformation online. If you need a recommendation for a derm downtown, I can vouch for Dr. Stolar.
Good luck!