Teething or sleep Regression?

So my LB is 14 weeks old today and last night we had one of the worse nights we’ve had in a while. We put him to bed at 6:30 and he usually sleeps till around 3:30/4:30am. Of course we do get wake ups between but not always. So last night he fell asleep at 6:30, woke at 7:50 and fell asleep again quite quickly. He slept till 11 which is very unusual for him. I tried to give him a bottle but he had little to no interest drinking maybe 1-2oz. After some soothing i got him back to sleep but he woke again at 12am and this continued through the whole night waking up every 30mins to an hr. I’ve tried feeding him but still have no interest. He wasn’t too interested in his bedtime bottle drinking maybe 4 out of 6oz but he does that quite often. So over the last 12 hours he’s only had maybe 8oz, where as usually he would have maybe 5/6oz at 6:30pm, then 5/6oz between 3:30/4:30 and then another 5/6oz between 6:30/7:30. Then that would continue throughout the day. When he is waking he is more fussy then usual as he doesn’t tend to wake up crying, it’s usually just cooing and noise to wake us up. But last night he sounded more uncomfortable and unhappy but still wasn’t crying. I’m very reluctant to give him calpol or any teething “medication” as I’m not sure if he is teething…he gums are very hard and I can see white on the side of the gum but I can’t see any actual coming out the top of his gum. He has been chewing and drooling recently. He doesn’t seem in pain or overly uncomfortable in the day time. It’s just so hard to understand and navigate!! I wish he could just talk to me!!!