Kinda stressed out

I’m a teen and I would like to describe myself has someone who stresses a lot and over things everything. Me and my boyfriend had sex for the first time October 14th and my period since then has come 3 times. But after that I realized I was not ready to have sex because I got really stressed that I was pregnant, so no more sex for me and my bf for now at least. But getting to the point my period has been late now by 7 days, the only thing me and my bf have done is dry hump, fingering, head and nothing involving the penis penetrating in the vagina. I’m overthinking it and I’m scared I’m pregnant!!! Please help!!! Also my boobs seem like have gotten bigger and are more sensible and veiny what does it mean