Got AstraZeneca last Friday.
I too received the AstraZeneca dose as my first shot on 15th April, I will receive my second shot on 1st July, I'm in my fourties.
I didn't have any adverse side effects from my first shot, maybe a slight headache that night but to tell you the truth I already had a headache before I went for the vaccine in the first place, but the following day I was 100% fine.
I know a few people that have had their first vaccination shot and felt really really really bad afterwards. Luckily both my mother (87) and father (94) have had their shots (both first and second doses) and just soldiered on with absolutely no aftereffects whatsoever.
Sadly I've spoken to a few people that said after receiving their first shot and the bad reaction that they had to it, they said that they will not be going for their second shot. But on the flip side, I also know people that had a really bad reaction to their first shot and said that they can't wait for their second shot to hopefully be fully vaccinated. I also sadly know of one person in her thirties that says she will not be taking any vaccine doses under any circumstances.
I personally can't wait to receive my second shot, it's only 5 weeks away so I say bring it on