Changes in my Cycle?

Gillian
Ive had the Nexplanon implant in my arm for about 8 months and about a month and a half ago i used a prescription that was known to dull the effects. since then i've had my period twice (bc of the Nexplanon i usually get it about every 10 days and after 8 months i'm used to it) about a week after my last period i found my breasts becoming very tender and larger and my nipples hurting if messed with. this symptom is fairly uncommon for me and when i asked my mom she said she knew she was pregnant almost immediate (intuition or whatever) and i'm worried this may be my discovery that i'm actually pregnant... ik this seems like very little evidence but i had evidence of ovulation a few days ago which you're not supposed to get when the nexplanon is working and this thing with my boobs is abnormal. on top of all this my period is boarding on being late. any advice or help in anyway would be much appreciated :)