Should I go get a check up? (Might be TMI, but idk what to do)

I haven’t had a regular period since I was like 15. I’m now 21. I also have PCOS. I only have one like every 3 months and it lasts like 3 days. My situation right now is that I haven’t had one for almost 4months now, but sometimes I get cramps, and other symptoms but it just doesn’t ever show up. Except whenever I have had sex in the past couple months I bleed after which probably isn’t normal right? Okay so with all that knowledge, yesterday morning I woke up and I had a blood clot but I haven’t bled since so I don’t think I’m on my period. But my dilemma is I’m not one to go to the doctor unless I’m absolutely dying and I keep telling myself it’s probably nothing. So my question is does this happen to anyone else is it serious or am I just crazy and it’s nothing?