pregnancy symptoms???!

So i'm the type of person to freak out over any symptom and relate it back to pregnancy, but to my defense almost every symptom can be tied to pregnancy! i'm not on any pill, the only birth control we use is a condom. i always make him check the condom after to make sure there's nothing leaking but i'm well aware that it's not a 100% guarantee with condoms. my period is irregular to begin with and about a month ago I had an irregular period that wasn't much of a period rather, I was spotting for a few days on and off, I was scared this might have been implantation  bleeding so i took a pregnancy test and it came back negative. it might have been too early to get a positive test but it calmed my nerves. now this month the same thing is happening except this time I feel nauseous/dizzy after eating and got a bad headache from the sunlight while driving. i feel weak and lazy and these are very different symptoms from my normal period. If anyone can help ease my anxiety that would be great! I"m gonna take a pregnancy test again this weekend and am quite worried :( just now decided on a career path and am looking forward to working on myself. thank you!