LogFAQs > #979358703

Hey I need some advice regarding my routine. I've started going to the gym again 3 weeks ago after not going for like 18 month due to various small niggling sports injuries that wouldn't go away.
I'm doing a push/pull split at the moment. Push day then pull day alternating monday to friday with rest days on a weekend. I'm increasing either my reps/sets or weight each time. The issue I have is that while I'm working out the last few sets are always a struggle. Maybe need to break the sets up and have a short 5-10 second rest before completing the full set, which I think is fine. My concern is that I'm not having any soreness or muscle pain. Like even though the work out is challenging and I feel a good pump, later that day - nothing. The next day - nothing. I'm worried that means I'm not working hard enough but the fact that the sets are challenging at the end makes me think I am.
Should I be working harder or is the lack of muscle soreness not an issue?