I've posted this question in the wrong section before and was unsure how to delete it because I'm new here, but I really need some advice.

Okay so I've been on the pill for about two months now, and during the second month I took it on time every single day and decided to overlap my first and second pack due to being on holiday. So everything was fine, but upon coming home I accidentally took the pill maybe 30-45 minutes late, and that night had unprotected sex with my boyfriend and he finished inside of me, which he usually never does, hence why I'm so worried. I was kind of worried afterwards, but not loads. Anyway I started having all this odd symptoms, at times I would feel kind of nauseated by food, whereas other times I'd still be hungry even after a meal, I experienced cramping which felt like period pain, some withdrawal bleeding which is normal apparently when you first start taking the pill and especially when overlapping, I've had back ache but have been working a lot and can kind of be explained and I've also been gassy/unsettled stomach. I don't know if all of these symptoms have come because of worry, as I have found when I've kind of calmed down then have subsided somewhat and the nausea kind of comes when I'm anxious about it. Two weeks after this sex I took two pregnancy tests and they were both negative but I know its too early and I should wait until 3 weeks which is this Tuesday. But I'm just so worried, do you think I could be pregnant? I've never missed any pills or had any ailments or medications that impact it. I'm just constantly worried and need to know if I'm being paranoid or if there really is reason to be concerned.