How much tylenol is too often?

OK so pre pregnancy i suffered from terrible migraines. The type that had pressure in my head, light and sound sensitivity, vomiting, nausea. And even at times i would lose feeling on one half of my body for about 15 min a time. But my neurologist said that was a normal part of my complex migraines.

Starting at 13 weeks my migraines started. As often as 2-3 a week. I take 2 tylenol and I'll be good for the day. But I feel like tylenol 2 or 3 times a weeks is too much. But I never take more then 2 in a 24 hour period. My ob said just not to take more then 4,000 MG in 24 hours. I haven't asked yet how often is too much. I'm now 18 weeks still suffering from migraines. What do you think is too often? Please no negative comments. I try to deal with them when I can but most days I can't even function let alone eat. Any reassurance and help is appreciated!