Should I be concerned?

I’m a 19 year old guy and I just fucked this girl I met on tinder. I’ve had some erection problems in the past but most of it was due to performance anxiety and being fat (lost weight now). I also probably have watched porn for the last 8 years daily for the most part with some small stretches of abstinence including a 6 month relationship. But I was wondering if I should be concerned about what happened. So today before leaving I took a 5mg dose of tadalifil for a better erection but honestly I don’t think there was enough time for it work since I had sex 1 hour after I took it. I met up with the girl from tinder and we starting making out in my car and I managed to get hard and probably get about 90 percent erection when I put it inside her my erection was good and became 100 percent after a good 15 seconds of thrusting. She came and then I also finished after about 15 min and I had no problems with erection. I waited 1-2 minutes after finishing and tried to fuck her again without getting any head from her I bent her over and tried to play with my dick a little to get it hard enough to put it in but I could only manage to get it to like a semi. Eventually seeing her ass on me got me hard and it got hard enough for penetration but it still kinda felt weak like 70-80 percent erection. And when we were switching positions it went down to like 50-60 which really concerned me. Also this might not be related but my hr was like 90-100 before I got there and was doing most of the work so maybe my heart was under a lot of stress idk. She didn’t say anything about it tho but I could tell she really enjoyed it cus she was fucking screaming the whole time and was wet as a slip n slide. I asked her about it and she said she did notice it was limp after the first round but that I shouldn’t stress ab it. But I am and I might wanna go to the doc and get it checked out bc my dick is never as hard as it is when I masturbate it reaches like full full erection. What do you guys think.