Someone please HELPPPP!!

Nohely

So I had my iud since May/June 2018 and everything was going good until I got with my current boyfriend. Every time we have sex I bleed and then start having a period. But recently while checking for my strings which I do frequently I couldn’t find them AT ALLL . About three months ago my obgyn shorten my strings to almost nothing but still able to feel. Me and my boyfriend have been having sex recently and he cummed inside me . I’m a week late from my irregular period . What should I do ?!???