advice please

Lili • Happiness can be found in the darkest of times if only one remembers to turn on the light.
So I got off the depo two cycles ago. So at the end of November/beginning of December. I had period, it was all brown blood and all that grossness. I was supposed to get my period before christmas, it hasn't come yet and normally it would be over by now. I am sexually active with my boyfriend, and we haven't been using condoms since starting depo. We found out that I am allergic to latex quickly after the depo was wearing off. So we haven't been really using condoms due to the fact that skyn condoms are hella expensive. But he's really good at pulling out in time and claims to have never pre chummed but once. So my boobs have been super sore and I haven't been feeling the best after eating food. I get dizzy sometimes just randomly for a few seconds. Im exhausted pretty much all the time. I took a pregnancy test today and it came out negative. What should I do? Should I talk to my doctor and get blood drawn? Or maybe is it all in my head?